file save and acces in Asp.net

string sPath = Server.MapPath("~/Test.txt");
// IT WILL LOOK LIKE THIS : D:\Folder1\Folder2\Text.txt
// The Sign ~ Represents You Current Web Directory
// SAVE THE PATH TO DATABASE

// While Clicking On Button Get Path From Database and...

if(File.Exists(sPath))
{
   // READ FILE DATA
}
else
{
   // FILE NOT FOUND (MESSAGE)
}

Sub WriteToFile(sender As Object, e As EventArgs)

        Dim fp As StreamReader

        Try
            fp = File.OpenText(Server.MapPath(".\Upload\") & "test.txt")
            txtMyFile.Text = fp.ReadToEnd()
            lblStatus.Text = "File Succesfully Read!"
            fp.Close()
        Catch err As Exception
            lblStatus.Text = "File Read Failed. Reason is as follows

" & err.ToString()
        Finally

        End Try

    End Sub