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Monday, 24 August 2015

Nested GridView Using c#.Net In Asp.Net

8/24/2015 - By Pranav Singh 0

This article will show you how you can bind nested grid view using c#.net in asp.net. In this I have used GridView RowDataBound to bind the nested gridview.




Here is the html code of the page.

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm22.aspx.cs" Inherits="WebApplication2.WebForm22" %>

<!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>Nested GridView Using c#.Net In Asp.Net</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False"
            onrowdatabound="a" Width="100%">
            <Columns>
                <asp:TemplateField HeaderText="Roll No">
                    <ItemTemplate>
                        <asp:Label ID="Label1" runat="server" Text='<%# Eval("RollNo") %>'></asp:Label>
                    </ItemTemplate>
                </asp:TemplateField>
                <asp:TemplateField HeaderText="Name">
                    <ItemTemplate>
                        <asp:Label ID="Label2" runat="server" Text='<%# Eval("Name") %>'></asp:Label>
                    </ItemTemplate>
                </asp:TemplateField>
                <asp:TemplateField HeaderText="Subject &amp; Marks">
                    <ItemTemplate>
                        <asp:GridView ID="GridView2" runat="server" AutoGenerateColumns="False">
                            <Columns>
                                <asp:BoundField DataField="Marks" HeaderText="Marks" />
                                <asp:BoundField DataField="Subject" HeaderText="Subject" />
                            </Columns>
                        </asp:GridView>
                    </ItemTemplate>
                </asp:TemplateField>
            </Columns>
        </asp:GridView>
    </div>
    </form>
</body>
</html>

In this we will add the .cs page code.

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

namespace WebApplication2
{
    public partial class WebForm22 : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                DataTable objDataTable = new DataTable();
                objDataTable = GetDataInDataTable();
                GridView1.DataSource = objDataTable;
                GridView1.DataBind();
            }
        }

        protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
        {
            if (e.Row.RowType == DataControlRowType.DataRow)
            {
                Label lblRollNo = (Label)e.Row.FindControl("Label1");
                GridView GridView2 = (GridView)e.Row.FindControl("GridView2");
                DataTable objDataTable = new DataTable();
                objDataTable = GetDataInDataTableMarks().AsEnumerable().Where(m => m.Field<int>("RollNo") == Convert.ToInt32(lblRollNo.Text)).CopyToDataTable();
                if (objDataTable.Rows.Count > 0)
                {
                    GridView2.DataSource = objDataTable;
                    GridView2.DataBind();
                }
            }
        }
        /// <summary>
        /// Function to prepate data of dataset
        /// </summary>
        /// <returns></returns>
        protected DataTable GetDataInDataTable()
        {
            DataTable objDataTable = new DataTable();
            objDataTable.Columns.Add("RollNo", typeof(int));
            objDataTable.Columns.Add("Name", typeof(string));

            objDataTable.Rows.Add("1", "Rajesh");
            objDataTable.Rows.Add("2", "Suresh");
            objDataTable.Rows.Add("3", "Pranav");

            return objDataTable;
        }
        /// <summary>
        /// Function to prepate data of dataset
        /// </summary>
        /// <returns></returns>
        protected DataTable GetDataInDataTableMarks()
        {

            DataTable objDataTable = new DataTable();
            objDataTable.Columns.Add("RollNo", typeof(int));
            objDataTable.Columns.Add("Subject", typeof(string));
            objDataTable.Columns.Add("Marks", typeof(string));

            objDataTable.Rows.Add("1", "Maths", "89");
            objDataTable.Rows.Add("1", "Physics", "70");
            objDataTable.Rows.Add("2", "Maths", "65");
            objDataTable.Rows.Add("2", "Physics", "78");
            objDataTable.Rows.Add("3", "Maths", "99");
            objDataTable.Rows.Add("3", "Physics", "78");

            return objDataTable;
        }
    }
}

In above code I have created two data table. It will act as table. You can use your sql table. In above I have a master table of student and other is the sub table which is student marks table.
Now we have done run the application to check the output.

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