private void button1_Click(object sender, EventArgs e) { DataTable stockReport = stockBLL.GetStockReport(Convert.ToDateTime(dateTimePicker1.Text.Trim()), Convert.ToDateTime(dateTimePicker2.Text.Trim()), Convert.ToInt32(comboBox1.SelectedValue), Convert.ToString(comboBox2.SelectedValue)); dataGridView1.AutoGenerateColumns = true; dataGridView1.DataSource = stockReport; this.dataGridView1.AllowUserToAddRows = false; dataGridView1.Columns[3].ReadOnly = true; }