VB Control after click event completes - vb.net

Question

I'm having a problem with a click-event that deletes a series of controls. In stepping though the click event, everything works perfectly but other text box controls on the page are being blanked out (not deleted, just losing their text content). I've stepped through the code and found that everything is find going into the "End Sub" statement of the click event but the blanking out happens when the End Sub is executed. I'm attaching the click event but there's not much to see. Any ideas what's happening?
Private Sub btnDelete_Click(sender As Object, e As EventArgs) Handles btnDelete.Click
CommonDelete(tbline.Text)
End Sub
Public Sub CommonDelete(LineNum As Integer)
Dim i As Integer = 0
Dim j As Integer = 0
Dim lineFound As Boolean = False
Dim LineInt As Integer = 0
Dim VLength As String = " "
Dim VLengthInt As Integer = 0
topLine = 0
bottomLine = 0
VLength = arrTextVals.GetLength(1)
VLengthInt = CInt(VLength)
Try
LineInt = CInt(LineNum)
Catch ex As Exception
MessageBox.Show("The line you selected is invalid", "Drop Zone Error DL1:",
MessageBoxButtons.OK,
MessageBoxIcon.Exclamation,
MessageBoxDefaultButton.Button1)
Exit Sub
End Try
For i = 1 To VLengthInt - 1
If arrTextVals(1, i) = LineNum Then
lineFound = True
Exit For
End If
Next
If lineFound <> True Then
MessageBox.Show("The line you selected is invalid", "Drop Zone Error DL2:",
MessageBoxButtons.OK,
MessageBoxIcon.Exclamation,
MessageBoxDefaultButton.Button1)
Exit Sub
End If
For j = i To VLengthInt - 2
topLine = j
bottomLine = j + 1
SwitchRows()
Next
RemoveControl(arrTextVals(0, bottomLine))
RemoveControl(arrTextVals(2, bottomLine))
RemoveControl(arrTextVals(4, bottomLine))
RemoveControl(arrTextVals(6, bottomLine))
tbline.Text = " "
End Sub
Private Sub RemoveControl(ControlName As String)
Dim ctr As Control
For Each ctr In Me.Controls
If ctr.Name = ControlName Then
Me.Controls.Remove(ctr)
Exit Sub
End If
Next ctr
End Sub