Auto Indent Line

Hi I I been playing with the codeDOM compiler of an example I seen in here, and decided to make my own little IDE only for console apps.

anyway I did not like the normal TAB spaces so I replaced them with 4 spaces, I also liked the auto indent feature in the VB editor and wanted some like that for my IDE anyway here what I made.
Hope you find it useful comments and suggestions welcome.

Code:

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'Put a TextBox on a form name it txtcode and paste this code in top area of form.
'Press F5 hit Tab and then press enter you see it indent the new line.

Public Class Form1

    Public Function GetWhiteCount(ByVal Source As String) As Integer
        Dim idx As Integer = 0
        'Count White Spaces On Left Of String.
        For Each c As Char In Source
            If c <> " " Then
                Exit For
            End If
            idx += 1
        Next c
        'Return Count.
        Return idx
    End Function

    Public Function FillChar(ByVal c As Char, ByVal Size As Integer) As String
        Return New String(c, Size)
    End Function

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        txtCode.AcceptsTab = True
    End Sub

    Private Sub txtCode_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles txtCode.KeyPress
        Dim sLine As String = vbNullString
        Dim iCount As Integer = 0
        Dim Line As Integer = 0

        If (e.KeyChar = vbTab) Then
            e.Handled = True
            e.KeyChar = CChar(vbNullChar)
            'Replace TABs with 4 Spaces.
            txtCode.SelectedText = FillChar(" "c, 4)
        End If

        'Exit If TextBox Is Empry
        If String.IsNullOrEmpty(txtCode.Text) Then
            Exit Sub
        End If

        If (e.KeyChar = vbCr) Then
            e.Handled = True
            'Get Current Line.
            Line = txtCode.GetLineFromCharIndex(txtCode.SelectionStart)

            Try
                'Get Text Line.
                sLine = txtCode.Lines(Line)
                iCount = GetWhiteCount(sLine)
            Catch ex As Exception
                iCount = 0
            End Try
            'Add CRLF And Extra Indent
            txtCode.SelectedText = vbCrLf & FillChar(" "c, iCount)
        End If

    End Sub
End Class

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