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i have a database table and it has some column with duplicate values , and i want to get that column value of the table in a combobox, but i want every value single time not repeatedly ... i tried but it is still giving me all values in the combobox:
Dim conn As New SqlConnection("Data Source=.\SQLEXPRESS;Initial Catalog=grade;Integrated Security=True;Pooling=False")
Dim cmd As SqlCommand
Dim Classes As New List(Of String)
Try
    conn.Open()
    Dim query As String = "SELECT Class FROM Class"
    cmd = New SqlCommand(query, conn)
    Dim rd As SqlDataReader = cmd.ExecuteReader(CommandBehavior.CloseConnection)
    While rd.Read()
        Classes.Add(rd("Class").ToString)
    End While
    rd.Close()
    conn.Close()
 
    Me.ComboClass.Items.Clear()
    Me.ComboClass.Items.AddRange(Classes.ToArray)
 
Catch ex As Exception
    MessageBox.Show(ex.ToString())
 

End Try
Posted 8-Nov-12 8:44am

1 solution

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Solution 1

SELECT DISTINCT Class FROM Class
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Comments
ridoy 8-Nov-12 13:49pm
   
+5
Marcus Kramer 8-Nov-12 13:59pm
   
Thanks, ridoy
RaisKazi 8-Nov-12 13:51pm
   
Simple short and correct. 5ed.
Marcus Kramer 8-Nov-12 13:59pm
   
Thanks Rais

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