Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click

        Dim intFileSizeLimit As Integer = 10
        Dim strFileNameWithPath As String = FileUpload1.PostedFile.FileName
        Dim strExtensionName As String = System.IO.Path.GetExtension(strFileNameWithPath)
        Dim strFileName As String = System.IO.Path.GetFileName(strFileNameWithPath)
        Dim intFileSize As Integer = FileUpload1.PostedFile.ContentLength / 1024

        strExtensionName = strExtensionName.ToLower()

        If strExtensionName.Equals(".jpg") OrElse strExtensionName.Equals(".gif") Then
            If intFileSize < intFileSizeLimit Then
                Dim bmp As New Bitmap(FileUpload1.PostedFile.InputStream)
                If bmp.Height < 100 And bmp.Width < 100 Then
                    lblMessage.Text = "Uploaded file details <hr />" & "File path on your Computer: " & strFileNameWithPath & "<br />" & "File Name: " & strFileName & "<br />" & "File Extension Name: " & strExtensionName & "<br />" & "File Size: " & intFileSize.ToString()
                    FileUpload1.PostedFile.SaveAs(Server.MapPath("~/Upload/") & strFileName)
                Else
                    lblMessage.Text = "File size exceeded than limit 100 X 100, Please upload smaller file."
                End If
            Else
                lblMessage.Text = "File size exceeded than limit " & intFileSizeLimit & " KB, Please upload smaller file."
            End If
        Else
            lblMessage.Text = "Only .jpg or .gif file are allowed, try again!"
            lblMessage.ForeColor = System.Drawing.Color.Red
        End If
    End Sub