Bind Nested GridView in ASP.Net

This article shows how to bind a nested GridView and work with it. The following is the procedure.

Step 1

First we create two tables in a database as in the following:

create table TeamLeader(
id int identity(1,1) Primary key,
Name nvarchar(30),
Age int,
Branch nvarchar(10)
)

And:

Create table TeamMember(
iid int identity(1,1) primary key,
TLid int CONSTRAINT FKTeamMemberPKTeamMember REFERENCES TeamLeader(id),
MemberName [nvarchar](50),
Age int,
Branch nvarchar(50)
)

Step 2

Insert some data into the table like the following:

Insert some data into table

Step 3

Now create a website, add a webpage and copy the design code as in the following:

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Example.aspx.cs" Inherits="Example" %>
<!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:GridView ID="GVLeader" runat="server" AutoGenerateColumns="false" AlternatingRowStyle-BackColor="lightgreen"
DataKeyNames="id" OnRowCommand="GVLeader_RowCommand">
<Columns>
<asp:TemplateField HeaderText="Team Leader Name">
<ItemTemplate>
<asp:Label ID="Label1" runat="server" Text='<%# Eval("Name") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Age">
<ItemTemplate>
<asp:Label ID="Label2" runat="server" Text='<%# Eval("Age") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Branch">
<ItemTemplate>
<asp:Label ID="Label3" runat="server" Text='<%# Eval("Branch") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Team Member" ControlStyle-BackColor="#EBEBEB">
<ItemTemplate>
<asp:Button ID="Button1" runat="server" Text="See Member" CommandName='<%#Eval("id") %>' CommandArgument='<%#
Container.DataItemIndex%>' />
<asp:GridView ID="GVMember" AutoGenerateColumns="false" runat="server" AutoGenerateEditButton="true"
DataKeyNames="iid" OnRowCancelingEdit="GVMember_RowCancelingEdit" OnRowEditing="GVMember_RowEditing"
OnRowUpdating="GVMember_RowUpdating">
<Columns>
<asp:TemplateField HeaderText="Name">
<ItemTemplate>
<asp:Label ID="Label4" runat="server" Text='<%#Eval("MemberName") %>'></asp:Label>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox ID="TextBox4" runat="server" Text='<%#Eval("MemberName") %>'></asp:TextBox>
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Age">
<ItemTemplate>
<asp:Label ID="Label5" runat="server" Text='<%#Eval("Age") %>'></asp:Label>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox ID="TextBox5" runat="server" Text='<%#Eval("Age") %>'></asp:TextBox>
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Branch">
<ItemTemplate>
<asp:Label ID="Label6" runat="server" Text='<%#Eval("Branch") %>'></asp:Label>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox ID="TextBox6" runat="server" Text='<%#Eval("Branch") %>'></asp:TextBox>
</EditItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
</div>
</form>
</body>
</html>

Your design will look like the following:

Design View

Write the following code in the aspx.cs 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;
public partial class Example : System.Web.UI.Page
{
SqlConnection con = new SqlConnection("data source=RAHUL-PC\\RAHUL_PC;initial catalog=Example;Integrated security=true;"); //Create sqlconnection
SqlDataAdapter da;
DataTable dt, dt1;
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
LoadGVLeader();
}
}
protected void GVLeader_RowCommand(object sender, GridViewCommandEventArgs e)
{
int id = int.Parse(e.CommandName.ToString());
int rowindex = int.Parse(e.CommandArgument.ToString());
GridView GVMember = (GridView)GVLeader.Rows[rowindex].FindControl("GVMember");
Button btn = ((Button)GVLeader.Rows[rowindex].FindControl("Button1"));
if (btn.Text == "See Member")
{
btn.Text = "Cancel";
GVMember.DataSource = LoadGVMember(id);
GVMember.DataBind();
GVMember.Visible = true;
}
else
{
btn.Text = "See Member";
GVMember.Visible = false;
}
}
public void LoadGVLeader()
{
da = new SqlDataAdapter("Select * from TeamLeader", con);
dt = new DataTable();
da.Fill(dt);
GVLeader.DataSource = dt;
GVLeader.DataBind();
}
protected DataTable LoadGVMember(int id)
{
da = new SqlDataAdapter("select * from TeamMember where TLid=" + id, con);
dt1 = new DataTable();
da.Fill(dt1);
return dt1;
}
protected void GVMember_RowEditing(object sender, GridViewEditEventArgs e)
{
GridView Gv = (GridView)sender;
GridViewRow gvrow = (GridViewRow)Gv.Parent.Parent;
int id = int.Parse(GVLeader.DataKeys[gvrow.RowIndex].Value.ToString());
Gv.EditIndex = e.NewEditIndex;
Gv.DataSource = LoadGVMember(id);
Gv.DataBind();
}
protected void GVMember_RowCancelingEdit(object sender, GridViewCancelEditEventArgs e)
{
GridView Gv = (GridView)sender;
GridViewRow gvrow = (GridViewRow)Gv.Parent.Parent;
int id = int.Parse(GVLeader.DataKeys[gvrow.RowIndex].Value.ToString());
Gv.EditIndex = -1;
Gv.DataSource = LoadGVMember(id);
Gv.DataBind();
}
protected void GVMember_RowUpdating(object sender, GridViewUpdateEventArgs e)
{
GridView Gv = (GridView)sender;
GridViewRow gvrow = (GridViewRow)Gv.Parent.Parent;
int id = int.Parse(GVLeader.DataKeys[gvrow.RowIndex].Value.ToString());
int iid = int.Parse(Gv.DataKeys[e.RowIndex].Value.ToString());
string Name = ((TextBox)(Gv.Rows[e.RowIndex].FindControl("TextBox4"))).Text.Trim();
string Age = ((TextBox)(Gv.Rows[e.RowIndex].FindControl("TextBox5"))).Text.Trim();
string Branch = ((TextBox)(Gv.Rows[e.RowIndex].FindControl("TextBox6"))).Text.Trim();
da = new SqlDataAdapter("Update TeamMember set MemberName='" + Name + "',Age='" + Age + "',Branch='" + Branch + "' where iid=" + iid, con);
dt1 = new DataTable();
da.Fill(dt1);
Gv.EditIndex = -1;
Gv.DataSource = LoadGVMember(id);
Gv.DataBind();
}
}