Input string was not in a correct format.

Question

 

if (e.ColumnIndex == dataGridView.Columns["Delete"].Index && e.RowIndex >= 0)

{

//dataGridView.Rows.RemoveAt(e.RowIndex);

int i = 1; con.Open();

SqlCommand cmd = new SqlCommand("delete from MainBillForm where Billno=" + Convert.ToInt16(dataGridView.Rows[e.RowIndex].Cells[1].Value), con);

int count = cmd.ExecuteNonQuery();

if (count > 0)

{

MessageBox.Show("Record Deleted Successfully!");

}

dataGridView.DataSource = null;

displayDataGridView();

}