This code illustrate how to add a new Column in GridView on GridView1_RowCreated and add column value in GridView1_RowDataBound
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
public partial class dhilip : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
//instance of a datatable
DataTable dt = new DataTable();
//instance of a datarow
DataRow drow;
//creating two datacolums Column1 and Column2
DataColumn dcol1 = new DataColumn("Column1", typeof(string));
DataColumn dcol2 = new DataColumn("Column2", typeof(string));
//adding datacolumn to datatable
dt.Columns.Add(dcol1);
dt.Columns.Add(dcol2);
//loop for 10 rows
for (int i = 0; i < 10; i++)
{
//instance of a datarow
drow = dt.NewRow();
//add rows to datatable
dt.Rows.Add(drow);
//add Column values
dt.Rows[i][dcol1] = i.ToString();
dt.Rows[i][dcol2] = i.ToString();
}
//set gridView Datasource as dataTable dt.
GridView1.DataSource = dt;
//Bind Datasource to gridview
GridView1.DataBind();
}
protected void GridView1_RowCreated(object sender, GridViewRowEventArgs e)
{
//create a instance of table cell
// this table cell is going to add gridview as new column
TableCell tc = new TableCell();
//first cell must be -1 ie the header of gridview. if it header
if (e.Row.RowIndex == -1)
{
//add header column name. you can add more styles in this section
tc.Text = "Multiple";
//add style for header column
tc.Style.Add(HtmlTextWriterStyle.FontWeight, "bold");
}
//cell add to gridview row
e.Row.Cells.Add(tc);
}
protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
//if header column we dont need multiplication
if (e.Row.RowIndex != -1)
{
//taking values from first cell. my first cell contain value, you can change
string id = e.Row.Cells[0].Text;
//taking values from second cell. my second cell contain value, you can change
string id2 = e.Row.Cells[1].Text;
//multiplication
double mult = int.Parse(id) * int.Parse(id2);
//adding result to last column. coz we add new column in last.
e.Row.Cells[e.Row.Cells.Count - 1].Text = mult.ToString();
}
}
}
