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Retrieve Record from Database using QueryString Parameter in ASP.NET

In my previous article, we already covered query string concepts. In this article, we will cover how to get record from database using query string parameter. For this types of problem, we will take two webform, first webform is used for sending querystring and pass into second web form.

Design pattern

Step-1 : Take two Web Form in solution explorer (default.aspx, default2.aspx)
Step-2 :  Bind GridView on first page (default.aspx page) using SqlDataSource control.
Step-3 : Check "select checkbox using show smart tag.
Step-4 : Handle GridView SelectedIndexChanged event , also generate QueryString in it. look like



protected void GridView1_SelectedIndexChanged(object sender, EventArgs e)
    {
        Response.Redirect("~/Default2.aspx?id=" + GridView1.SelectedRow.Cells[1].Text);
    }


Step-5 : In second page( Default2.aspx), Bind form view using SqlDataSource with Query String parameter.

Retrieve Record from Database using QueryString Parameter in ASP.NET

Retrieve Record from Database using QueryString Parameter in ASP.NET

Code view 

Default.aspx with Default.aspx.cs 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">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <asp:SqlDataSource ID="SqlDataSource1" runat="server" 
        ConnectionString="<%$ ConnectionStrings:ConnectionString %>" 
        SelectCommand="SELECT * FROM [usertable]"></asp:SqlDataSource>
    <div>
    
    </div>
    <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" 
        DataKeyNames="id" DataSourceID="SqlDataSource1" 
        onselectedindexchanged="GridView1_SelectedIndexChanged">
        <Columns>
            <asp:CommandField ShowSelectButton="True" />
            <asp:BoundField DataField="id" HeaderText="id" InsertVisible="False" 
                ReadOnly="True" SortExpression="id" />
            <asp:BoundField DataField="name" HeaderText="name" SortExpression="name" />
            <asp:BoundField DataField="address" HeaderText="address" 
                SortExpression="address" />
        </Columns>
    </asp:GridView>
    </form>
</body>
</html>

// Code view

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

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

    }
    protected void GridView1_SelectedIndexChanged(object sender, EventArgs e)
    {
        Response.Redirect("~/Default2.aspx?id=" + GridView1.SelectedRow.Cells[1].Text);
    }
}

Default2.aspx 

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default2.aspx.cs" Inherits="Default2" %>

<!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></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:FormView ID="FormView1" runat="server" DataKeyNames="id" 
            DataSourceID="SqlDataSource1" Height="174px" Width="158px">
            <EditItemTemplate>
                id:
                <asp:Label ID="idLabel1" runat="server" Text='<%# Eval("id") %>' />
                <br />
                name:
                <asp:TextBox ID="nameTextBox" runat="server" Text='<%# Bind("name") %>' />
                <br />
                address:
                <asp:TextBox ID="addressTextBox" runat="server" Text='<%# Bind("address") %>' />
                <br />
                <asp:LinkButton ID="UpdateButton" runat="server" CausesValidation="True" 
                    CommandName="Update" Text="Update" />
                &nbsp;<asp:LinkButton ID="UpdateCancelButton" runat="server" 
                    CausesValidation="False" CommandName="Cancel" Text="Cancel" />
            </EditItemTemplate>
            <InsertItemTemplate>
                name:
                <asp:TextBox ID="nameTextBox" runat="server" Text='<%# Bind("name") %>' />
                <br />
                address:
                <asp:TextBox ID="addressTextBox" runat="server" Text='<%# Bind("address") %>' />
                <br />
                <asp:LinkButton ID="InsertButton" runat="server" CausesValidation="True" 
                    CommandName="Insert" Text="Insert" />
                &nbsp;<asp:LinkButton ID="InsertCancelButton" runat="server" 
                    CausesValidation="False" CommandName="Cancel" Text="Cancel" />
            </InsertItemTemplate>
            <ItemTemplate>
                id:
                <asp:Label ID="idLabel" runat="server" Text='<%# Eval("id") %>' />
                <br />
                name:
                <asp:Label ID="nameLabel" runat="server" Text='<%# Bind("name") %>' />
                <br />
                address:
                <asp:Label ID="addressLabel" runat="server" Text='<%# Bind("address") %>' />
                <br />

            </ItemTemplate>
        </asp:FormView>
        <asp:SqlDataSource ID="SqlDataSource1" runat="server" 
            ConnectionString="<%$ ConnectionStrings:ConnectionString %>" 
            SelectCommand="SELECT * FROM [usertable] WHERE ([id] = @id)">
            <SelectParameters>
                <asp:QueryStringParameter Name="id" QueryStringField="id" Type="Int32" />
            </SelectParameters>
        </asp:SqlDataSource>
    </div>
    </form>
</body>
</html>

Code Generate the following output

Retrieve Record from Database using QueryString Parameter in ASP.NET

Retrieve Record from Database using QueryString Parameter in ASP.NET

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