Sharing my Tech knowledge and experiences - Microsoft MVP ASP.Net: May 2010

May 30, 2010

Validations in Devexpress controls

This code shows usage of validations in Devexpress controls.

ASPX Page

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="ValidationsDev.aspx.cs" Inherits="ValidationsDev" %>

<%@ Register Assembly="DevExpress.Web.ASPxEditors.v9.2, Version=9.2.3.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a"
   Namespace="DevExpress.Web.ASPxEditors" TagPrefix="dx" %>
<%@ Register Assembly="DevExpress.Web.ASPxGridView.v9.2, Version=9.2.3.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a"
   Namespace="DevExpress.Web.ASPxGridView" TagPrefix="dxg" %>
   <%@ Register Assembly="DevExpress.Web.v9.2, Version=9.2.3.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a" Namespace="DevExpress.Web.ASPxTabControl" TagPrefix="dxtc" %>

   <%@ Register Assembly="DevExpress.Web.v9.2, Version=9.2.3.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a" Namespace="DevExpress.Web.ASPxPanel" TagPrefix="dxp" %>
<%@ Register Assembly="DevExpress.Web.v9.2, Version=9.2.3.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a" Namespace="DevExpress.Web.ASPxRoundPanel" TagPrefix="dxrp" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
   <title>Validations</title>

   <script src="Common.js" type="text/javascript"></script>

</head>
<body>
   <form id="form1" runat="server">
   <div>
   <%--Textbox validation example--%>
   <dx:ASPxLabel ID="lblSample" Text="Sample" runat="server" />
   <dx:ASPxTextBox ID="txtSample" ClientInstanceName="txtValidate" Width="170px" EnableClientSideAPI="true"
   runat="server" OnValidation="txtSample_Validation">
   <ValidationSettings SetFocusOnError="True" ErrorText="Name must be at least two characters long">
   <ErrorImage Height="16px" Width="16px" AlternateText="Error" />
   <RequiredField IsRequired="True" ErrorText="Name is required" />
   <ErrorFrameStyle ForeColor="Red">
   <Paddings Padding="3px" PaddingLeft="4px" />
   <Border BorderColor="#FD4D3E" BorderStyle="Solid" BorderWidth="1px" />
   <ErrorTextPaddings PaddingRight="3px" />
   </ErrorFrameStyle>
   </ValidationSettings>
   <ClientSideEvents Validation="OnNameValidation" />
   </dx:ASPxTextBox>
   <dx:ASPxLabel ID="lblAge" Text="Age" runat="server" />
   <dx:ASPxTextBox ID="txtAge" ClientInstanceName="txtAge" EnableClientSideAPI="true"
   runat="server" Width="170px" OnValidation="txtAge_Validation">
   <ValidationSettings SetFocusOnError="True" ErrorText="Age must be greater than or equal to 18">
   <ErrorImage Height="16px" Width="16px" AlternateText="Error" />
   <RequiredField IsRequired="True" ErrorText="Age is required" />
   <ErrorFrameStyle ForeColor="Red">
   <Paddings Padding="3px" PaddingLeft="4px" />
   <Border BorderColor="#FD4D3E" BorderStyle="Solid" BorderWidth="1px" />
   <ErrorTextPaddings PaddingRight="3px" />
   </ErrorFrameStyle>
   </ValidationSettings>
   <ClientSideEvents Validation="OnAgeValidation" />
   </dx:ASPxTextBox>
   <%--Combo box example--%>
   <dx:ASPxLabel ID="lblCity" Text="City" runat="server" />
   <dx:ASPxComboBox ID="cmbxCity" runat="server" ValueType="System.String">
   <Items>
   <dx:ListEditItem Text="1" Value="1" />
   <dx:ListEditItem Text="2" Value="2" />
   </Items>
   <ValidationSettings SetFocusOnError="true">
   <RequiredField ErrorText="City reuired" IsRequired="true" />
   <ErrorFrameStyle ForeColor="Red">
   <Paddings Padding="3px" PaddingLeft="4px" />
   <Border BorderColor="#FD4D3E" BorderStyle="Solid" BorderWidth="1px" />
   <ErrorTextPaddings PaddingRight="3px" />
   </ErrorFrameStyle>
   </ValidationSettings>
   </dx:ASPxComboBox>
   <br />
   <%--Get multiple values in combobox--%>
   <dx:ASPxComboBox ID="cmbxMultivalue" runat="server" EnableCallbackMode="True" EnableIncrementalFiltering="True"
   CallbackPageSize="10" ValueField="intGlCode" ValueType="System.String" DataSourceID="SqlDataSource1">
   <Columns>
   <dx:ListBoxColumn FieldName="varAreaName" />
   <dx:ListBoxColumn FieldName="varAreaCode" />
   <dx:ListBoxColumn FieldName="varAreaHead" />
   <dx:ListBoxColumn FieldName="varEmail" />
   </Columns>
   </dx:ASPxComboBox>
   <asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:BASF_1111ConnectionString %>"
   SelectCommand="SELECT * FROM [Area_Mst]"></asp:SqlDataSource>
   <%--Get selected values in listbox --%>
   <dx:ASPxListBox ID="lstbxItems" runat="server" SelectionMode="CheckColumn" DataSourceID="SqlDataSource1">
   <Columns>
   <dx:ListBoxColumn FieldName="varAreaName" />
   <dx:ListBoxColumn FieldName="varAreaHead" />
   <dx:ListBoxColumn FieldName="varAreaCode" />
   </Columns>
   </dx:ASPxListBox>
   <%--Gridview on dropdown click--%>
   <dx:ASPxDropDownEdit ID="drpEditTest" runat="server">
   <DropDownWindowTemplate>
   <dxg:ASPxGridView ID="ZoneGrid" DataSourceID="SqlDataSource1" runat="server"
   KeyFieldName="ID" Width="100%">
   <columns>
   <dxg:GridViewDataColumn FieldName="intGlCode" VisibleIndex="0">
   </dxg:GridViewDataColumn>
   <dxg:GridViewDataColumn FieldName="varAreaCode" VisibleIndex="1">
   </dxg:GridViewDataColumn>
   <dxg:GridViewDataColumn FieldName="varAreaName" VisibleIndex="2">
   </dxg:GridViewDataColumn>
   <dxg:GridViewDataTextColumn FieldName="varAreaHead" VisibleIndex="3">
   </dxg:GridViewDataTextColumn>
   <dxg:GridViewDataColumn FieldName="varEmail" VisibleIndex="4">
   </dxg:GridViewDataColumn>
   </columns>
   </dxg:ASPxGridView>
   </DropDownWindowTemplate>
   </dx:ASPxDropDownEdit>
   <dxg:ASPxGridView ID="ZoneGrid" DataSourceID="SqlDataSource1" runat="server"
   KeyFieldName="ID" Width="100%">
   <columns>
   <dxg:GridViewDataColumn FieldName="intGlCode" VisibleIndex="0">
   </dxg:GridViewDataColumn>
   <dxg:GridViewDataColumn FieldName="varAreaCode" VisibleIndex="1">
   </dxg:GridViewDataColumn>
   <dxg:GridViewDataColumn FieldName="varAreaName" VisibleIndex="2">
   </dxg:GridViewDataColumn>
   <dxg:GridViewDataTextColumn FieldName="varAreaHead" VisibleIndex="3">
   </dxg:GridViewDataTextColumn>
   <dxg:GridViewDataProgressBarColumn FieldName="Complete" VisibleIndex="4" PropertiesProgressBar-ShowPosition="true">
   </dxg:GridViewDataProgressBarColumn>
   <dxg:GridViewDataColumn FieldName="varEmail" VisibleIndex="5">
   </dxg:GridViewDataColumn>
   </columns>
   </dxg:ASPxGridView>
   <dxrp:ASPxRoundPanel ID="rndpnlSample" runat="server" ShowHeader="False">
   <PanelCollection>
   <dxp:PanelContent>
   <dxtc:ASPxTabControl runat="server" ID="tbSample" DataSourceID="XmlDataSource1">
   </dxtc:ASPxTabControl>
   <asp:XmlDataSource ID="XmlDataSource1" runat="server" DataFile="~/XMLFile.xml">
   </asp:XmlDataSource>
   </dxp:PanelContent>
   </PanelCollection>
   </dxrp:ASPxRoundP nel>
   </div>
   </form>
</body>
</html>

Code behind page

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class ValidationsDev : System.Web.UI.Page
{
   protected void Page_Load(object sender, EventArgs e)
   {

   }
   protected void txtSample_Validation(object sender, DevExpress.Web.ASPxEditors.ValidationEventArgs e)
   {
   if ((e.Value as string).Length < 2)
   e.IsValid = false;
   }
   protected void txtAge_Validation(object sender, DevExpress.Web.ASPxEditors.ValidationEventArgs e)
   {
   string strAge = ((string)e.Value).TrimStart('0');
   if (strAge.Length == 0)
   return;
   UInt32 age = 0;
   if (!UInt32.TryParse(strAge, out age) || age < 18)
   e.IsValid = false;
   }
}

May 10, 2010

Insert/Add, Update, Edit, Delete in ASPXgridview - Devexpress

This code demonstrates how to Add/Insert, Update, delete, edit in Devexpress aspxgridview. Sorting and changing position of columns is by default enabled. Only to disable it you need to specify.

Note : You can download Devexpress controls from www.devexpress.com

For validation on controls visit this link

I have tried this with versions 9.2.3 and 9.3.2. For example purpose I have used connection strings and queries in same file but for you, you need to retrieve it from web.config file and also use stored procedures.

Aspx Page

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="GridviewWithAddUpdateEditDelete.aspx.cs" Inherits="GridviewWithDelete" %>

<%@ Register Assembly="DevExpress.Web.v9.2, Version=9.2.3.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a"
   Namespace="DevExpress.Web.ASPxPopupControl" TagPrefix="dx" %>
<%@ Register Assembly="DevExpress.Web.ASPxGridView.v9.2, Version=9.2.3.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a"
   Namespace="DevExpress.Web.ASPxGridView" TagPrefix="dx" %>
<%@ Register Assembly="DevExpress.Web.ASPxEditors.v9.2, Version=9.2.3.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a"
   Namespace="DevExpress.Web.ASPxEditors" TagPrefix="dxe" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
   <title>Gridview With Delete</title>
</head>
<body>
   <form id="form1" runat="server">
   <div>
   <dxe:ASPxLabel ID="lblMessage" runat="server" Text="" ForeColor="Red" Font-Bold="true" Visible="false" />
   <dxe:ASPxButton ID="btnDelete" runat="server" Text="Delete" onclick="btnDelete_Click">
   </dxe:ASPxButton>
   <dx:ASPxGridView ID="devg" runat="server" ClientInstanceName="devg"
   KeyFieldName="intGLCode" AutoGenerateColumns="False"
   Width="554px" onafterperformcallback="devg_AfterPerformCallback"
   onrowinserting="devg_RowInserting" onrowupdating="devg_RowUpdating">
   <Columns>
   <dx:GridViewCommandColumn Caption="New" VisibleIndex="1">
   <NewButton Visible="true" />
   <EditButton Visible="true" />
   </dx:GridViewCommandColumn>
   <dx:GridViewCommandColumn Caption="Delete" ShowSelectCheckbox="True" VisibleIndex="0">
   <HeaderTemplate>
   <%--To select/unselect all rows in gridview--%>
   Delete<input type="checkbox" id="CheckBoxControl" name="SelectAllCheckbox"
   onclick="devg.SelectAllRowsOnPage(this.checked);" runat="server" />
   </HeaderTemplate>
   </dx:GridViewCommandColumn>

   <dx:GridViewDataTextColumn Caption="ID" FieldName="ID" Name="ID" Visible="false">
   </dx:GridViewDataTextColumn>
   <dx:GridViewDataTextColumn Caption="Name" FieldName="varName" Name="varName" Settings-AllowSort="False" VisibleIndex="2">
   </dx:GridViewDataTextColumn>
   <dx:GridViewDataTextColumn Caption="Contact No" FieldName="varContactNo" Name="varContactNo" Settings-AllowSort="False" VisibleIndex="3">
   </dx:GridViewDataTextColumn>
   <dx:GridViewDataTextColumn Caption="Email" FieldName="varEmail" Name="varEmail" VisibleIndex="4">
   </dx:GridViewDataTextColumn>
   <dx:GridViewDataTextColumn Caption="Address" FieldName="varAddress" Name="varAddress" VisibleIndex="5">
   </dx:GridViewDataTextColumn>
   </Columns>
   <Settings ShowStatusBar="Visible" />
   <SettingsEditing Mode="PopupEditForm" />
   </dx:ASPxGridView>
   <dx:ASPxPopupControl ID="popupSample" runat="server" ShowCloseButton="true" ShowHeader="true"
   PopupHorizontalAlign="WindowCenter" PopupVerticalAlign="WindowCenter">
   </dx:ASPxPopupControl>
   </div>
   </form>
</body>
</html>

Code behind page

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data.SqlClient;
using System.Data;
using System.Text;
using DevExpress.Web.Data;
using DevExpress.Web.ASPxGridView;

public partial class GridviewWithDelete : Page
{
   protected void Page_Load(object sender, EventArgs e)
   {

   }

   protected void Page_Init(object sender, EventArgs e)
   {
   BindGrid();
   }

   private void BindGrid()
   {
   SqlConnection conn = new SqlConnection("Connection string here");
   try
   {
   conn.Open();
   SqlCommand cmd;

   cmd = new SqlCommand("select ID,varName,varContactNo,varEmail,varAddress from ContactDetails");
   cmd.Connection = conn;
   DataSet dsClaimCat = new DataSet();

   SqlDataAdapter dapt = new SqlDataAdapter(cmd);
   dapt.Fill(dsClaimCat);
   devg.DataSource = dsClaimCat;
   devg.DataBind();
   conn.Close();
   }
   catch
   {
   Response.Write("Error");
   }
   }
   protected void btnDelete_Click(object sender, EventArgs e)
   {
   string strMultiIds;
   List<object> selectedRowList;

   strMultiIds = string.Empty;
   selectedRowList = (devg.GetSelectedFieldValues(new string[] { "ID" }));
   if (selectedRowList.Count == 0)
   {
   System.Windows.Forms.MessageBox.Show("Please Select Atleast one Record to Delete");
   return;
   }

   for (int i = 0; i < selectedRowList.Count; i++)
   { strMultiIds += selectedRowList[i].ToString() + ","; }

   strMultiIds.TrimEnd(',');
   try
   {
   delete(strMultiIds.TrimEnd(','));
   }
   catch(Exception ex)
   {
   lblMessage.Visible = true;
   lblMessage.Text = ex.Message;
   }
   BindGrid();
   }

   private void delete(string p)
   {
   if (p.Equals(""))
   return;
   try
   {
   deleteRows(p, "ContactDetails");
   }
   catch(Exception ex)
   {
   lblMessage.Visible = true;
   lblMessage.Text = ex.Message;
   }
   }

   private void deleteRows(string selectedid, string tablename)
   {
   StringBuilder sqlQuery = new StringBuilder();
   selectedid = selectedid.TrimEnd(',') + ",0";
   StringBuilder whereClause = new StringBuilder();
   whereClause.Append(" WHERE ID IN (" + selectedid + ") ");
   sqlQuery.Append(" DELETE FROM ");
   sqlQuery.Append(tablename + whereClause.ToString());
   try
   {
   SqlConnection conn = new SqlConnection("Connection string here");
   conn.Open();
   SqlCommand cmd;

   cmd = new SqlCommand(sqlQuery.ToString());
   cmd.Connection = conn;
   DataSet dsClaimCat = new DataSet();

   SqlDataAdapter dapt = new SqlDataAdapter(cmd);
   dapt.Fill(dsClaimCat);
   devg.DataSource = dsClaimCat;
   devg.DataBind();
   conn.Close();
   lblMessage.Visible = true;
   lblMessage.Text = "Record(s) Deleted";
   }
   catch (Exception ex)
   {
   lblMessage.Visible = true;
   lblMessage.Text = ex.Message;
   }
   }
   protected void devg_AfterPerformCallback(object sender, ASPxGridViewAfterPerformCallbackEventArgs e)
   {
   BindGrid();
   }
   protected void devg_RowUpdating(object sender, ASPxDataUpdatingEventArgs e)
   {
   StringBuilder sqlQuery = new StringBuilder();
   SqlConnection conn = new SqlConnection("Connection string here");
   sqlQuery.Append("UPDATE ContactDetails SET ");
   sqlQuery.Append("varName = '" + e.NewValues["varName"].ToString() + "',");
   sqlQuery.Append("varContactNo = '" + e.NewValues["varContactNo"].ToString() + "',");
   sqlQuery.Append("varEmail = '" + e.NewValues["varEmail"].ToString() + "',");
   sqlQuery.Append("varAddress = '" + e.NewValues["varAddress"].ToString() + "'");
   sqlQuery.Append(" WHERE ID= "+ e.Keys["ID"]+"");
   conn.Open();
   SqlCommand cmd;

   cmd = new SqlCommand(sqlQuery.ToString());
   cmd.Connection = conn;
   DataSet dsClaimCat = new DataSet();

   SqlDataAdapter dapt = new SqlDataAdapter(cmd);
   int i = cmd.ExecuteNonQuery();
   if (i > 0)
   {
   e.Cancel = true;
   devg.CancelEdit();
   }
   lblMessage.Visible = true;
   lblMessage.Text = "Record(s) Updated";
   BindGrid();
   conn.Close();
   }
   protected void devg_RowInserting(object sender, ASPxDataInsertingEventArgs e)
   {
   StringBuilder sqlQuery = new StringBuilder();
   SqlConnection conn = new SqlConnection("connection string here");
   sqlQuery.Append("INSERT INTO ContactDetails(varName,varContactNo,varEmail,varAddress) VALUES ( ");
   sqlQuery.Append("'" + e.NewValues["varName"].ToString() + "',");
   sqlQuery.Append("'" + e.NewValues["varContactNo"].ToString() + "',");
   sqlQuery.Append("'" + e.NewValues["varEmail"].ToString() + "',");
   sqlQuery.Append("'" + e.NewValues["varAddress"].ToString() + "')");
   conn.Open();
   SqlCommand cmd;

   cmd = new SqlCommand(sqlQuery.ToString());
   cmd.Connection = conn;
   DataSet dsClaimCat = new DataSet();

   SqlDataAdapter dapt = new SqlDataAdapter(cmd);
   int i = cmd.ExecuteNonQuery();
   if (i > 0)
   {
   e.Cancel = true;
   devg.CancelEdit();
   }
   lblMessage.Visible = true;
   lblMessage.Text = "Record(s) Saved";
   BindGrid();
   conn.Close();
   }

}

May 4, 2010

Create Devexpress Bar chart - Webchartcontrol - Xtracharts

This code shows how its easy to use a Bar chart in your Web applications.

To start with first of all download and install Devexpress controls from www.devexpress.com

Here I am going to make a bar chart with the use of WebchartControl (Xtracharts)

Note : I have used version 9.2.3

Code .cs Page

using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data.SqlClient;
using System.Data;
using DevExpress.XtraCharts;
using System.Drawing;

public partial class _Default : System.Web.UI.Page
{
   protected void Page_Load(object sender, EventArgs e)
   {
   BindChart();
   }

   private void BindChart()
   {
   SqlConnection conn = new SqlConnection("Connection string here");
   try
   {
   conn.Open();
   SqlCommand cmd;
   cmd = new SqlCommand("select * from Transactions"); // my sample query
   cmd.Connection = conn;
   DataSet dsClaimCat = new DataSet();

   SqlDataAdapter dapt = new SqlDataAdapter(cmd);
   dapt.Fill(dsClaimCat);
   WebChartControl1.DataSource = dsClaimCat.Tables[0];
   //Values for X-axis
   WebChartControl1.SeriesDataMember = dsClaimCat.Tables[0].Columns["percentage"].ToString();
   //Values for Y-axis
   WebChartControl1.SeriesTemplate.ArgumentDataMember = dsClaimCat.Tables[0].Columns["paymentDays"].ToString();
   WebChartControl1.SeriesTemplate.ValueDataMembers.AddRange(new string[] { dsClaimCat.Tables[0].Columns["percentage"].ToString() });
   string paletteName = "MyPalette";
   PaletteEntry entry1 = new PaletteEntry(Color.Green, Color.LightGreen);
   Palette palette = new Palette(paletteName, new PaletteEntry[] { entry1 });
   WebChartControl1.PaletteRepository.Add(paletteName, palette);
   WebChartControl1.PaletteName = paletteName;
   SideBySideBarSeriesView v = new SideBySideBarSeriesView();
   v.BarWidth = 0.4;

   WebChartControl1.SeriesTemplate.View = v;
   WebChartControl1.DataBind();

   conn.Close();
   }
   catch
   {
   Response.Write("Error");
   }
   }
}

Design Page

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<%@ Register Assembly="DevExpress.XtraCharts.v9.2.Web, Version=9.2.3.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a"
   Namespace="DevExpress.XtraCharts.Web" TagPrefix="dxchartsui" %>
<%@ Register Assembly="DevExpress.XtraCharts.v9.2, Version=9.2.3.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a"
   Namespace="DevExpress.XtraCharts.Web" TagPrefix="cci" %>
<%@ Register Assembly="DevExpress.XtraCharts.v9.2, Version=9.2.3.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a"
   Namespace="DevExpress.XtraCharts" TagPrefix="cc1" %>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
   <title></title>
</head>
<body>
   <form id="form1" runat="server">
   <div>
   <dxchartsui:WebChartControl ID="WebChartControl1" runat="server" Height="200px" Width="300px"
   PaletteName="The Trees">
   <SeriesTemplate LabelTypeName="SideBySideBarSeriesLabel" PointOptionsTypeName="PointOptions"
   SeriesViewTypeName="SideBySideBarSeriesView">

   <View HiddenSerializableString="to be serialized">
   </View>
   <Label HiddenSerializableString="to be serialized" LineVisible="True">
   <FillStyle FillOptionsTypeName="SolidFillOptions">
   <Options HiddenSerializableString="to be serialized"></Options>
   </FillStyle>
   </Label>
   <PointOptions HiddenSerializableString="to be serialized">
   </PointOptions>
   <LegendPointOptions HiddenSerializableString="to be serialized">
   </LegendPointOptions>
   </SeriesTemplate>
   <FillStyle FillOptionsTypeName="SolidFillOptions">
   <Options HiddenSerializableString="to be serialized"></Options>
   </FillStyle>
   </dxchartsui:WebChartControl>
   </div>
   </form>
</body>
</html>

Sharing my Tech knowledge and experiences - Microsoft MVP ASP.Net