Public Class frmMailtexte
    Private Sub frmMailtexte_Load(sender As Object, e As EventArgs) Handles MyBase.Load
        Me.ComboBox1.Items.Clear()
        Dim db As New clsDB
        db.Get_Tabledata("Replacer", "", "Select MailElement from MailTexte_Replacer")
        For Each r As DataRow In db.dsDaten.Tables(0).Rows
            Me.ComboBox1.Items.Add(r(0))
        Next
    End Sub

    Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
        Me.txtinhalt.Text = Me.txtinhalt.Text.Insert(Me.txtinhalt.SelectionStart, Me.ComboBox1.Text)
    End Sub
End Class