Attempted to read or write protected memory.This is often an Indication that other memory is corrupt

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VB

Private Sub btnbrowse_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnbrowse.Click
       Dim img As String

       Dim myStream As Stream = Nothing


       ' openFileDialog1.InitialDirectory = Application.StartupPath
       OpenFileDialog1.Filter = "Image Files(*.jpg)|*.jpg|Image Files(*.png)|*.png|Image Files(*.bmp)|*.bmp|Image Files(*.gif)|*.gif"



       If OpenFileDialog1.ShowDialog() = System.Windows.Forms.DialogResult.OK Then
           Try
               myStream = OpenFileDialog1.OpenFile()
               If (myStream IsNot Nothing) Then
                   txtfile.Text = ""
                   img = OpenFileDialog1.FileName
                   txtfile.Text = OpenFileDialog1.FileName
               End If
           Catch Ex As Exception
               MessageBox.Show("Cannot read file from disk. Original error: " & Ex.Message)
           Finally
               If (myStream IsNot Nothing) Then
                   myStream.Close()
               End If
           End Try
       End If
   End Sub

I am using the above code when i click the browse button in windows7 the following error occurs .
"
Attempted to read or write protected memory.This is often an Indication that other memory is corrupt"

Please help me guys I have stucked ...