Works Perfectly...

My final code:

Load Sub:
Code:
        Dim file = My.Application.CommandLineArgs(0)
        Try
            If Not file = "" Then
                Me.rtxtResult.LoadFile(file, RichTextBoxStreamType.PlainText)
                'Dim objreader As New IO.StreamReader(file)
                'rtxtResult.Text = objreader.ReadToEnd()
                'objreader.Close()
            End If

        Catch ex As Exception
            MessageBox.Show(String.Format("Error while attempting to load file {0}file = {1}{0}{0}{2}", _
                                          Environment.NewLine, file, ex.Message))
        End Try

I also replaced streamreader (as advised) with this:

Code:
        Me.rtxtResult.LoadFile(LoadFileLocation, RichTextBoxStreamType.PlainText)

Thanks a lot everyone who contributed to helping me to fix this issue...