how to get sum dynamically of datagridview column in textbox

Question

I want to get the sum of a column of datagridview and show that in textbox. After each entry the sum should be changed dynamically. For that I am using textChanged event of

Answer 1

this is the best simple way :

private void your_name()
{

    Double your_variable = dataGridView1.Rows.Cast().Sum(x => Convert.ToDouble(x.Cells["Column4"].Value));

    this.textBox1.Text = your_variable.ToString("N2");
}