How to Fill Data with Two Display Member Based on ComboBox in C#

Submitted by janobe on Wednesday, April 24, 2019 - 12:55.

In this tutorial, I will teach you how to fill data with two display member based on combobox using c#. This method will illustrate how the two fields will link each other using the concatenation process. It also has the ability to display two fields in the combobox at the same time. This method is simple yet so helpful when you are dealing with combobox.

Step 1

Open Microsoft Visual Studio 2015 and create a new windows form application in C#.
ps1

Step 2

Do the form just like shown below.
ps2

Step 3

Press F7 to open the code editor. In the code editor, add a namespace for OLeDB to access OLeDB libraries.

using System.Data.OleDb;

Step 4

Create a connection between access database and c#. After that, declare all the classes that are needed.

OleDbConnection con = new OleDbConnection("Provider = Microsoft.ACE.OLEDB.12.0; Data Source =" + Application.StartupPath + "/studentdb.accdb");
        OleDbCommand cmd;
        OleDbDataAdapter da;
        DataTable dt;

Step 5
Create a method for filling data in the combobox.

        private void fill_data(string sql,ComboBox cbo)
        {
 
            try
            {
                con.Open();
                cmd = new OleDbCommand();
                da = new OleDbDataAdapter();
                dt = new DataTable();
 
                cmd.Connection = con;
                cmd.CommandText = sql;
 
                da.SelectCommand = cmd;
                da.Fill(dt);
 
                cbo.DataSource = dt;
                cbo.DisplayMember = "Name";
                cbo.ValueMember = "ID";
 
            }catch(Exception ex)
            {
                MessageBox.Show(ex.Message);
 
            }
            finally
            {
                con.Close();
                da.Dispose(); 
            }
        }

Step 6
Do the following code to execute the method that you have created in the first load of the form.

        private void Form1_Load(object sender, EventArgs e)
        {
            string sql;
            sql = "SELECT ID,(Fname + ' ' + Lname) as Name FROM tblstudent";
            fill_data(sql, comboBox1);
        }

Download the complete sourcecode and run it on your computer.
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Alternative Tutorial Titles

An alternative title for the tutorial could be... "How to fill a combo box with items using the control's DataSource, DisplayMember and ValueMember properties". or "How to create a non-value-returning function that fills a combo box with data items". Anyways, your tutorial is good.