How to select an bounded combo box value and display its value into an Label Text

Question

I have an ComboBox1 which is bounded by EmpId which is an primary key also.. when i used the code

private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
{
      label5.Text = comboBox1.DisplayMember;
}

it gives an error-

Column 'EmpId' is constrained to be unique. Value 'Emp008' is already present.

My question is How to select that bounded value and display it into an Label text..

Answer 1

您可以使用此代码comboBox1.SelectedValue获取所选值，或者对于文本，可以使用此代码comboBox1.SelectedText

Answer 2

 private void bind()
    {
        SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["AttendanceManagmentSystem.Properties.Settings.Cons1"].ConnectionString);
        con.Open();
        SqlDataAdapter da = new SqlDataAdapter("Select EmpId from EmpDetail", con);
        DataTable dt = new DataTable();
        da.Fill(dt);
        comboBox1.DisplayMember = "EmpId";
        comboBox1.ValueMember = "EmpId";
        comboBox1.DataSource = dt;
        con.Close();
    }
    private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
    {
        label5.Text = comboBox1.Text;
    }