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DataView Filter

<%@ Page language="c#"  Inherits="DataViewFilter" CodeFile="Default.aspx.cs" %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" > <HTML>   <body>     <form method="post" runat="server" ID="Form1">       <b><u>Filter = "ProductName = 'Chocolade' "</u></b><br>       <br>       <asp:GridView runat="server" ID="Datagrid1" HeaderStyle-Font-Bold="true" />       <br>       <STRONG><U>Filter = "UnitsInStock = 0 AND UnitsOnOrder = 0" </U></STRONG>       <br>       <asp:GridView runat="server" ID="Datagrid2" HeaderStyle-Font-Bold="true" />       <br>       <STRONG><U>Filter = <STRONG><U>"ProductName LIKE 'P%'"</U></STRONG></U></STRONG><br>       <br>       <asp:GridView runat="server" ID="Datagrid3" HeaderStyle-Font-Bold="true" />     </form>   </body> </HTML> File: Default.aspx.cs using System; using System.Collections; using System.ComponentModel; using System.Data; using System.Drawing; using System.Web; using System.Web.SessionState; using System.Web.UI; using System.Web.UI.WebControls; using System.Web.UI.HtmlControls; using System.Data.SqlClient; public partial class DataViewFilter : System.Web.UI.Page {   protected void Page_Load(object sender, System.EventArgs e)   {     string connectionString = "Data Source=localhost;Initial Catalog=Northwind;Integrated Security=SSPI";     SqlConnection con = new SqlConnection(connectionString);     string sql = "SELECT ProductID, ProductName, UnitsInStock, UnitsOnOrder, Discontinued FROM Products";     SqlDataAdapter da = new SqlDataAdapter(sql, con);     DataSet ds = new DataSet();     da.Fill(ds, "Products");     DataView view1 = new DataView(ds.Tables["Products"]);     view1.RowFilter = "ProductName = 'Chocolade'";     Datagrid1.DataSource = view1;     DataView view2 = new DataView(ds.Tables["Products"]);     view2.RowFilter = "UnitsInStock = 0 AND UnitsOnOrder = 0";     Datagrid2.DataSource = view2;     DataView view3 = new DataView(ds.Tables["Products"]);     view3.RowFilter = "ProductName LIKE 'P%'";     Datagrid3.DataSource = view3;     this.DataBind();   } }