How To Sum Value Of Gridview Column In C#.net (Win App)

@shadab khan

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on btn_click
{
int sum = 0;
 for (int i = 0; i < dataGridView1.Rows.Count; ++i)
 {
sum += Convert.ToInt32(dataGridView1.Rows[i].Cells[4].Value);
 }
 txtsum.text = sum.ToString();
}