Fill data in ComboBox from DataTable using Access database

Question

I have a two column table in an MS Access database and want to fill its second column in a ComboBox from where the user can make a selection. I'm using a DataTable to do it. The code is below:

 

private void Form1_Load(object sender, EventArgs e)

{

OleDbConnection connect = new OleDbConnection(@"Provider=Microsoft.ACE.OLEDB.12.0; Data Source=C:\Users\Anas\Dropbox\C# Projects\2.Database\ClOsODb.accdb; Persist Security Info=False");

connect.Open();

OleDbCommand cmd = new OleDbCommand("select * from Course Number and Name", connect);

OleDbDataReader odr = null;

odr = cmd.ExecuteReader();

DataTable table = new DataTable();

table.Load(odr);

course_Number_and_NameComboBox.DataSource = table;

course_Number_and_NameComboBox.BindingContext = this.BindingContext;

course_Number_and_NameComboBox.DisplayMember = "Course Number and Name";

course_Number_and_NameComboBox.ValueMember = "ID";

connect.Close();

}

 

 However, the problem is that when I run the application, the ComboBox is empty! It doesn't get filled. Can anyone help me and tell me where I am wrong and what should I do? Help will be greatly appreciated.

 

Also, can anyone tell me how will I get the value in the first column of the selected row of the DataTable when a selection is made at the ComboBox(in other words, when an item will be selected in the ComboBox-second column of a row in the table-how will I know which row is selected in the ComboBox and how will I get the value in the first column of the same row)? 

Answer 1

Hi you can try this code
private void Form1_Load(object sender, EventArgs e)
{
OleDbConnection connect = new OleDbConnection(@"Provider=Microsoft.ACE.OLEDB.12.0; Data Source=C:\Users\Anas\Dropbox\C# Projects\2.Database\ClOsODb.accdb; Persist Security Info=False");
connect.Open();
string cmd = "select * from Course Number and Name";
OleDbDataAdapter adapter = new OleDbDataAdapter(new OleDbCommand(strSql, connect));
 DataSet ds = new DataSet();
adapter.Fill(ds);

course_Number_and_NameComboBox.DataSource = ds.Tables[0];
course_Number_and_NameComboBox.DisplayMember = "Course Number and Name";
course_Number_and_NameComboBox.ValueMember = "ID";
connect.Close();
}

Answer 2

But I am using C#, not VB. Sorry I did not mention it in the question.

Answer 3

Hi you can try below code

Dim cn As New OleDbConnection("provider=Provider=Microsoft.ACE.OLEDB.12.0;data source=C:\Users\Anas\Dropbox\C# Projects\2.Database\ClOsODb.accdb")

   Dim da As New OleDbDataAdapter()

   Dim dt As New DataTable()

   Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

      cn.Open()

      da.SelectCommand = New OleDbCommand("select * from [course Number and Name]", cn)

      da.Fill(dt)

 

      ComboBox1.DataSource = dt

      ComboBox1.DisplayMember = "Course Number and Name";

      ComboBox1.ValueMember = "ID";

 

      ' or this way

      ComboBox1.Items.Clear()

      Dim r As DataRow

      For Each r In dt.Rows

         ComboBox1.Items.Add(r(1).ToString)

      Next

      cn.Close()

   End Sub