private void pictureBox2_Click(object sender, EventArgs e)
        {
            frmStudentAdd frm = new frmStudentAdd(this);

            frm.btnUpdate.Enabled = false;
            frm.ShowDialog();
        }
        private void dataGridView1_CellContentClick(object sender, DataGridViewCellEventArgs e)
        {
            string colName = dataGridView1.Columns[e.ColumnIndex].Name;

            if (colName == "Edit")
            {
                frmStudentAdd frm = new frmStudentAdd(this);
                frm.btnSave.Enabled  = false;
                frm.txtRegno.Text    = dataGridView1.Rows[e.RowIndex].Cells[0].Value.ToString();
                frm.txtName.Text     = dataGridView1.Rows[e.RowIndex].Cells[1].Value.ToString();
                frm.txtBirthDay.Text = dataGridView1.Rows[e.RowIndex].Cells[2].Value.ToString();
                frm.txtAddress.Text  = dataGridView1.Rows[e.RowIndex].Cells[3].Value.ToString();
                frm.txtPhoneno.Text  = dataGridView1.Rows[e.RowIndex].Cells[4].Value.ToString();
                frm.ShowDialog();
            }
            else if (colName == "Delete")
            {
                if (MessageBox.Show("Are you sure do you want to delete this record?", "Deleting", MessageBoxButtons.YesNo, MessageBoxIcon.Question) == DialogResult.Yes)
                {
                    cn.Open();
                    cm = new SqlCommand("delete from tblStudent where regno like '" + dataGridView1.Rows[e.RowIndex].Cells[0].Value.ToString() + "'", cn);
                    cm.ExecuteNonQuery();
                    cn.Close();
                    MessageBox.Show("Your record has been successfully deleted.");
                    LoadRecord();
                }
            }
        }