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Display Sum of two columns values in Gridview

Posted By:satyapriyanayak       Posted Date: February 08, 2014    Points: 40    Category:    URL: http://www.dotnetspark.com  

In this Code Snippets we will know how to display Sum of two columns values in Gridview.

Table structure
Create table test (id int, one int, two int)

I have 2 text box and one insert  button .on clicking to insert  button values of both the two text box got saved in database and I can display them on gridview . Now i want that there should be a 3rd column in Gridview which display the total of two numbers

id    one    two    Sum
1    1          2       3
2    1          1       2
3    1          4       5
4    5          5       10
5    10        10     20

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="Sum._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>Untitled Page</title>
    <form id="form1" runat="server">
    <asp:Label ID="Label1" runat="server" Text="Enter first Number" Width="150px"></asp:Label>
    <asp:TextBox ID="txtOne" runat="server" Width="150px"></asp:TextBox>
        <asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server"
            ControlToValidate="txtOne" ErrorMessage="Enter first Number"></asp:RequiredFieldValidator>
        <br />
    <asp:Label ID="Label2" runat="server" Text="Enter second Number" Width="150px"></asp:Label>
    <asp:TextBox ID="txtTwo" runat="server" Width="150px"></asp:TextBox>
        <asp:RequiredFieldValidator ID="RequiredFieldValidator2" runat="server"
            ControlToValidate="txtTwo" ErrorMessage="Enter second Number"></asp:RequiredFieldValidator>
        <br />
    <asp:Button ID="btn_insert" runat="server" Text="Insert"
            onclick="btn_insert_Click" />
    <asp:GridView ID="GridView1" runat="server">
    <asp:Label ID="lblmsg" runat="server" Text="Label"></asp:Label>

using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.Data.SqlClient;
namespace Sum
    public partial class _Default : System.Web.UI.Page
        string connStr = ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;
        SqlCommand com;
        SqlDataAdapter sqlda;
        DataSet ds;
        string str;

        protected void Page_Load(object sender, EventArgs e)
            if (!IsPostBack)
        private void bindgrid()
            SqlConnection con = new SqlConnection(connStr);
            str = "select *,(one + two)as 'Sum'  from test";
            com = new SqlCommand(str, con);
            sqlda = new SqlDataAdapter(com);
            ds = new DataSet();
            sqlda.Fill(ds, "test");
            GridView1.DataMember = "test";
            GridView1.DataSource = ds;

        protected void btn_insert_Click(object sender, EventArgs e)
            SqlConnection con = new SqlConnection(connStr);
            com = new SqlCommand();
            com.Connection = con;
            com.CommandType = CommandType.Text;
            com.CommandText = "insert into test values(@one,@two)";
            com.Parameters.AddWithValue("@one", txtOne.Text);
            com.Parameters.AddWithValue("@two", txtTwo.Text);
            if (con.State == ConnectionState.Closed)
            lblmsg.Text = "Data entered successfully!!!";
        private void clear()
            txtOne.Text = "";
            txtTwo.Text = "";


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