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Trying to secure a memory read or write. This often indicates that other memory is corrupt

I've created a control combobox Winforms AutoComplete, inheriting ComboBox, with the following method:

Protected Overrides Sub OnKeyPress(ByVal e As System.Windows.Forms.KeyPressEventArgs)
        MyBase.OnKeyPress(e)
        Dim text As String = Me.Text
        If Char.IsLetter(e.KeyChar) Then
            text = text + e.KeyChar
        End If
        If (text.Length = AutoCompleteSearchChars And Char.IsLetter(e.KeyChar)) Then
            SetAutoCompleteMethod.Invoke(text)
            Me.AutoCompleteSource = AutoCompleteSource.ListItems
            Me.Text = text
            Me.SelectionStart = text.Length
            Me.SelectionLength = 0
            If Me.Items.Count > 0 Then
                Me.SelectedIndex = 0
            End If
            e.Handled = True
        End If
    End Sub

"SetAutoCompleteMethod" - is a delegate pointing to the method that fills the combobox items based on the use of the current text in the combo box as a prefix to the wildcard search. It provides similar functionality to the drop-down list of autocomplete ajax.

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System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 , ApplicationContext)
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