>1. Is there a function in .NET (C#) that works like the FileToStr?
>2. If so, will VFP StrToFile function be able to read that string value created in C# and still create the PDF?

Here it is:

        ' FileToStr() VFP equivalent
        ' expC1 File name
        Public Function FileToStr(ByVal tcFileName As String) As String
            Dim lcString As String = ""
            Dim lnCounter As Integer = 0
            Dim lnDelay As Integer = 500
            Dim lnRetry As Integer = 8
            Dim loFile As IO.StreamReader

            For lnCounter = 1 To lnRetry

                Try
                    loFile = New IO.StreamReader(tcFileName, True)
                    lcString = loFile.ReadToEnd()
                    loFile.Close()
                    Exit For

                Catch loError As Exception

                    ' If we have not reached the maximum tries of 8, we retry
                    If lnCounter < 8 Then

                        ' Wait for a timeout before retrying
                        System.Threading.Thread.Sleep(lnDelay)

                        Continue For
                    End If

                    ' Get the proper definition as per the current scope
                    If oProcess Is Nothing Then
                        oApp.ErrorSetup(loError, tcFileName)
                    Else
                        oProcess.ErrorSetup(loError, tcFileName)
                    End If

                End Try

            Next

            Return lcString
        End Function