hi
You can use following code
protected void girdview_selectedindexchange(..
{
DataTable dt = new DataTable();
dt.Columns.Add("ID");
dt.Columns.Add("Name");
dt.Columns.Add("Age");
DataRow dataRow;
dataRow = dt.NewRow();
int i2 = 1;
for (int i = 0; i < dataRow.Table.Columns.Count; i++)
{
dataRow[i] = GridView1.SelectedRow.Cells[i2].Text;
i2++;
}
dt.Rows.Add(dataRow);
lit_NewDataTable.Text = "New DataTable in a DataGrid:<br />";
DataGrid1.DataSource = dt;
DataGrid1.DataBind();
}