save a text and a value into combobox from a database table

Question

I want to take the name and surname of users from the table "EMPLOYE" (SQL DB) and save them in the combobox. I want to save the ID of each user in the combobox value. so this is my code =>

       public void fill_combobox_users()
    {
        // auto-complete
        comboBox3.AutoCompleteMode = AutoCompleteMode.SuggestAppend;
        comboBox3.AutoCompleteSource = AutoCompleteSource.ListItems;

        da = new SqlDataAdapter("select ID_EMP, concat(NOM_EMP,' ',PRENOM_EMP) as 'nom_prenom' from EMPLOYE", cn);
        DataTable dt = new DataTable();
        try
        {
            cn.Open();
            da.Fill(dt);
            comboBox3.DataSource = dt;
            comboBox3.DisplayMember = "nom_prenom";
            comboBox3.ValueMember = "ID_EMP";
        }

        catch (Exception ex)
        {
            MessageBox.Show(ex.Message);
        }

        finally
        {
            cn.Close();
        }

    }

The full name displayed without problems but the value no !! The problem is that the combobox3.ValueMember take the string "ID_EMP" not the value from the table EMPLOYE !

ANY SOLUTIONS PLEASE ?

Answer 1

Edit your sql query like this. Should work

 public void fill_combobox_users()
        {
            // auto-complete
            comboBox3.AutoCompleteMode = AutoCompleteMode.SuggestAppend;
            comboBox3.AutoCompleteSource = AutoCompleteSource.ListItems;

            da = new SqlDataAdapter("select ID_EMP,(NOM_EMP+ ' ' + PRENOM_EMP) AS NOMM from EMPLOYE", cn);
            DataTable dt = new DataTable();
            try
            {
                cn.Open();
                da.Fill(dt);
                comboBox3.DataSource = dt;
                comboBox3.DisplayMember = "NOMM";
                comboBox3.ValueMember = "ID_EMP";
            }

            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }

            finally
            {
                cn.Close();
            }

        }

Answer 2

要获得价值尝试

MessageBox.Show(comboBox3.SelectedValue.ToString())

Answer 3

Column Name is problem you want use Column index see here.

 public void fill_combobox_users()
    {
        // auto-complete
        comboBox3.AutoCompleteMode = AutoCompleteMode.SuggestAppend;
        comboBox3.AutoCompleteSource = AutoCompleteSource.ListItems;

        da = new SqlDataAdapter("select ID_EMP,(NOM_EMP+ ' ' + PRENOM_EMP) AS NOMM from EMPLOYE", cn);
        DataTable dt = new DataTable();
        try
        {
            cn.Open();
            da.Fill(dt);
            comboBox3.DataSource = dt;
            comboBox3.DisplayMember = dt.Columns[1].ColumnName;
            comboBox3.ValueMember = dt.Columns[0].ColumnName;
        }

        catch (Exception ex)
        {
            MessageBox.Show(ex.Message);
        }

        finally
        {
            cn.Close();
        }

    }