private void dataGridView1_CellContentClick(object sender, DataGridViewCellEventArgs e)
        {
            string colName = dataGridView1.Columns[e.ColumnIndex].Name;

            try
            {
                if (colName == "Edit")
                {
                    frmAddSalary frm = new frmAddSalary(this);
                    frm.btnSave.Enabled = false;
                    frm.txtEmpId.Text   = dataGridView1.Rows[e.RowIndex].Cells[1].Value.ToString();
                    frm.txtName.Text    = dataGridView1.Rows[e.RowIndex].Cells[2].Value.ToString();
                    frm.txtSalary.Text  = dataGridView1.Rows[e.RowIndex].Cells[3].Value.ToString();
                    frm.ShowDialog();
                }
                else if (colName == "Delete")
                {
                    if (MessageBox.Show("Are you sure you want to delete this record?", "Delete", MessageBoxButtons.YesNo, MessageBoxIcon.Question) == DialogResult.Yes)
                    {
                        con.Open();
                        cm = new SqlCommand("Delete from tblSalary where emp_id like '" + dataGridView1.Rows[e.RowIndex].Cells[1].Value.ToString() + "'", con);
                        cm.ExecuteNonQuery();
                        con.Close();
                        MessageBox.Show("Your record has been successfully deleted!");
                        LoadRecord();
                    }
                }
            }catch (Exception er)
            {
                MessageBox.Show(er.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Warning);
            }
        }
        private void pictureBox2_Click(object sender, EventArgs e)
        {
            frmAddSalary frm = new frmAddSalary(this);

            frm.Show();
        }