How to read data from tables and display in a combobox and textbox

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I HAVE A FORM WHERE I WANT TO RETRIEVE DATA FROM A TABLE WHERE TWO COLUMNS OF CODE AND SUBJECTS. THE FORM HAS A COMBOBOX AND TEXTBOX.WHEN I SELECT THE CODE FROM THE COMBOBOX THEN THE CORRECT SUBJECT IS DISPLAYED ON THE TEXTBOX

What I have tried:

VB

DIM CON AS OLEDBCOMMAND=NEW OLEDBCOMMAND("PROVIDER=MICROSOFT.JET.OLEDB.4.0;DATA SOURCE=D;
CON.OPEN
DIM CMD AS OLEDBCOMMAND=NEW OLEDBCOMMAND("SELECT FROM SUBJECTS", CON)
DR=CMD.EXECUTE READER()
WHILE DR.READ=TRUE
CMBSUBJECT.ITEMS.ADD(DR(0))

TXTSUBJECT.TEXT=DR.GETVALUE(1)
END WHILE

Posted 26-Aug-18 22:41pm

Member 13924837

Updated 27-Aug-18 2:09am

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Comments

Richard MacCutchan 27-Aug-18 5:22am

You are setting the textbox from the first combobox entry. You need a combobox event hander to capture the selectionchanged event.

BTW: your caps lock button seems to be stuck.

Nelek 27-Aug-18 7:16am

In addition I miss a (") in your code.

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a.mohamedyasin · Accepted Answer · 2018-08-27T02:10:00

Just try with below example

Dim dt As New DataTable
        dt.Columns.Add("Id", GetType(Int32))
        dt.Columns.Add("Data", GetType(String))
        dt.Rows.Add(1, "Test1")
        dt.Rows.Add(2, "Test2")
        ComboBox1.DataSource = dt
        ComboBox1.DisplayMember = "Data"
        ComboBox1.ValueMember = "Id"

Private Sub ComboBox1_SelectedValueChanged(sender As Object, e As EventArgs) Handles ComboBox1.SelectedValueChanged
       If Not IsNothing(ComboBox1.SelectedItem) Then
           If Not IsNothing(ComboBox1.SelectedValue) Then
               txtValueTxt.Text = ComboBox1.SelectedValue
           End If

           txtDisplayText.Text = DirectCast(ComboBox1.SelectedItem, System.Data.DataRowView).Row.ItemArray(1)

       End If

   End Sub

don't forget to accept answer if you got solution.