Filtering Data
<%@ Page Language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
"http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
<title>Show Filtered Products</title>
</head>
<body>
<form id="form1" runat="server">
<asp:DropDownList
id="ddlProductCategory"
DataSourceID="srcProductCategories"
DataTextField="Name"
DataValueField="Id"
Runat="server" />
<asp:Button
id="btnSelect"
Text="Select"
Runat="server" />
<asp:GridView
id="grdProducts"
DataSourceID="srcProducts"
AutoGenerateColumns="false"
Runat="server">
<Columns>
<asp:BoundField
DataField="Title"
HeaderText="Product Title" />
<asp:BoundField
DataField="Director"
HeaderText="Product Director" />
</Columns>
</asp:GridView>
<asp:ObjectDataSource
id="srcProductCategories"
TypeName="FilterProducts"
SelectMethod="GetProductCategories"
EnableCaching="true"
CacheDuration="Infinite"
Runat="server" />
<asp:ObjectDataSource
id="srcProducts"
TypeName="FilterProducts"
SelectMethod="GetProducts"
EnableCaching="true"
CacheDuration="Infinite"
FilterExpression="CategoryID={0}"
Runat="server">
<FilterParameters>
<asp:ControlParameter
Name="Category"
ControlID="ddlProductCategory" />
</FilterParameters>
</asp:ObjectDataSource>
</form>
</body>
</html>
File: FilterProducts.cs
using System;
using System.Web;
using System.Data;
using System.Data.SqlClient;
using System.Web.Configuration;
public class FilterProducts
{
private readonly string _conString;
public DataSet GetProducts()
{
SqlConnection con = new SqlConnection(_conString);
string commandText = "SELECT Title,Director,CategoryId FROM Products";
SqlDataAdapter dad = new SqlDataAdapter(commandText, con);
DataSet dstProducts = new DataSet();
using (con)
{
dad.Fill(dstProducts);
}
return dstProducts;
}
public DataSet GetProductCategories()
{
SqlConnection con = new SqlConnection(_conString);
string commandText = "SELECT Id,Name FROM ProductCategories";
SqlDataAdapter dad = new SqlDataAdapter(commandText, con);
DataSet dstCategories = new DataSet();
using (con)
{
dad.Fill(dstCategories);
}
return dstCategories;
}
public FilterProducts()
{
_conString = WebConfigurationManager.ConnectionStrings["Products"]. ConnectionString;
}
}
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