Add Field (Column) in ASP.Net GridView using RowDataBound event using C# and VB.Net

Hi ramco1917,

Please refer below sample.

SQL

CREATE TABLE [StudentsData]
(
  [StudentName] VARCHAR (30),
  [StudentCode] VARCHAR (30),
  [Address] VARCHAR (30)
)
GO
INSERT INTO [StudentsData] VALUES ('ABC','36565','India')
INSERT INTO [StudentsData] VALUES ('ZXA','52121','UK')
INSERT INTO [StudentsData] VALUES ('SXZ','24524','France')
INSERT INTO [StudentsData] VALUES ('EDC','54024','Russia')
GO
CREATE PROCEDURE GetStudentsData
AS
	BEGIN
	   SELECT StudentName, StudentCode, Address  
	   FROM StudentsData  
	END    
GO
EXEC GetStudentsData

HTML

<asp:GridView ID="gvDetails" runat="server" AutoGenerateColumns="false"
    OnRowDataBound="gvDetails_DataBound">
    <Columns>
        <asp:BoundField HeaderText="Name" DataField="StudentName" />
        <asp:BoundField HeaderText="Code" DataField="StudentCode" />
        <asp:BoundField HeaderText="Address" DataField="Address" />
    </Columns>
</asp:GridView>

Namesapce

C#

using System.Data;
using System.Data.SqlClient;
using System.Configuration;

VB.Net

Imports System.Data
Imports System.Data.SqlClient
Imports System.Configuration

Code

C#

protected void Page_Load(object sender, EventArgs e)
{
    if (!this.IsPostBack)
    {
        string conString = ConfigurationManager.ConnectionStrings["constr"].ConnectionString;
        using (SqlConnection con = new SqlConnection(conString))
        {
            using (SqlCommand cmd = new SqlCommand("GetStudentsData", con))
            {
                cmd.CommandType = CommandType.StoredProcedure;
                con.Open();
                gvDetails.DataSource = cmd.ExecuteReader();
                gvDetails.DataBind();
                con.Close();
            }
        }
    }
}

protected void gvDetails_DataBound(object sender, GridViewRowEventArgs e)
{
    if (e.Row.RowType == DataControlRowType.Header)
    {
        TableHeaderCell headerCell = new TableHeaderCell();
        headerCell.Text = "Mark";
        e.Row.Cells.Add(headerCell);
    }

    if (e.Row.RowType == DataControlRowType.DataRow)
    {
        TableCell cell = new TableCell();
        cell.Text = ((e.Row.RowIndex + 1) * 10).ToString();
        e.Row.Cells.Add(cell);
    }
}

VB.Net

Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
    If Not Me.IsPostBack Then
        Dim conString As String = ConfigurationManager.ConnectionStrings("constr").ConnectionString
        Using con As SqlConnection = New SqlConnection(conString)
            Using cmd As SqlCommand = New SqlCommand("GetStudentsData", con)
                cmd.CommandType = CommandType.StoredProcedure
                con.Open()
                gvDetails.DataSource = cmd.ExecuteReader()
                gvDetails.DataBind()
                con.Close()
            End Using
        End Using
    End If
End Sub

Protected Sub gvDetails_DataBound(ByVal sender As Object, ByVal e As GridViewRowEventArgs)
    If e.Row.RowType = DataControlRowType.Header Then
        Dim headerCell As TableHeaderCell = New TableHeaderCell()
        headerCell.Text = "Mark"
        e.Row.Cells.Add(headerCell)
    End If

    If e.Row.RowType = DataControlRowType.DataRow Then
        Dim cell As TableCell = New TableCell()
        cell.Text = ((e.Row.RowIndex + 1) * 10).ToString()
        e.Row.Cells.Add(cell)
    End If
End Sub

Screenshot