asp.net - WKHTMLTOPDF Hangs up for certain files from ASP.NET

Question

I'm using wkhtmltopdf.exe file to create PDF files from my asp.net web application. But unfortunately for certain files the process continues to run for unlimitted and the application freezes. But the same html file I was able to convert using command prompt. I really doubts there is any file size limit for the html when converting from asp.net? Is it?

Other files from the same URL working without any issue using the converter. but certain large files failed from asp.net. This is my code

  Dim fileContent As Byte() = Nothing

    Dim process As New System.Diagnostics.Process()
    process.StartInfo.UseShellExecute = False
    process.StartInfo.CreateNoWindow = True

    'set the executable location
    process.StartInfo.FileName = Path.Combine(Server.MapPath("~/bin/"), "wkhtmltopdf.exe")
    'set the arguments to the exectuable
    ' wkhtmltopdf [OPTIONS]... <input fileContent> [More input fileContents] <output fileContent>
    process.StartInfo.Arguments = "--margin-top 20 --margin-bottom 20 " + url + " d:\ssss\output.pdf"
    process.StartInfo.RedirectStandardOutput = True
    process.StartInfo.RedirectStandardError = True
    process.StartInfo.RedirectStandardInput = True
    'run the executable
    process.Start()
    'Dim output As String = process.StandardOutput.ReadToEnd()
    'Dim buffer As Byte() = process.StandardOutput.CurrentEncoding.GetBytes(output)

    'wait until the conversion is done
    process.WaitForExit()

    ' read the exit code, close process    
    Dim returnCode As Integer = process.ExitCode
    process.Close()

After WaitForExit triggers its running for unlimitted or not getting stopped and seems to be the conversion is failed.