How to delete selected row for data grid view in C# 2010 windows forms

private void btnDelete_Click(object sender, EventArgs e)
       {
           int IdColumn = 0; // enter the correct value for Id Column or the column which you are using it for deleting..
           foreach (DataGridViewRow row in this.dataGridView1.SelectedRows)
           {
               dataGridView1.Rows.RemoveAt(row.Index);
               int id = Convert.ToInt32(row.Cells[IdColumn].Value);
               // write your sql command to delete this id
               //
           }
       }