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Private Sub RichTextBox1_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles RichTextBox1.TextChanged
Dim sss As String = RichTextBox1.Text
If Not sss.Contains("aaa") Then
Dim intSelectionStart As Integer = RichTextBox1.SelectionStart
RichTextBox1.AppendText("aaa")
RichTextBox1.SelectionStart = intSelectionStart
End If
End Sub
Private Sub MemoEdit1_EditValueChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MemoEdit1.EditValueChanged
Dim sss As String = MemoEdit1.Text
If Not sss.Contains("aaa") Then
Dim intSelectionStart As Integer = MemoEdit1.SelectionStart
MemoEdit1.Text = MemoEdit1.Text & "aaa"
MemoEdit1.SelectionStart = intSelectionStart
End If
End Sub