Best How To :

We have found out another way instead of looking for TwainDSM dll for x64 which we couldn't actually within my company.

I had posted a subject to twainforum about it, after some time an answer has been returned to me - the link is below:

TwainForum Link That I posted about the issue!

well, it was not good enough to find my way out at that time. Before getting an answer, we got an agreement that we can solve this using System.Diagnostics.Process class to work in x64 platforms depending our needs. The code I have used is in below:

        var proc = new System.Diagnostics.Process();
        String path = "";
        var pathArray = System.Windows.Forms.Application.StartupPath.Split('\\');
        for (int i = 0; i < pathArray.Count() - 1; i++)
        {
            path += pathArray[i] + "\\";
        }
        path = path + "fileName.EXE";
        proc.StartInfo.FileName = path;
        proc.StartInfo.RedirectStandardOutput = true;
        proc.StartInfo.UseShellExecute = false;

        proc.Start();
        string result = proc.StandardOutput.ReadToEnd();
        proc.WaitForExit();
        if (string.IsNullOrEmpty(result))
        {
            MessageBox.Show("No Response from Scanner Screen!", "ERROR!");
            return;
        }

But how to pass parameters from that exe to use it in my project? There's a way to do that! Just put one line code in Program.cs file of FileName.Exe like below: (I have also put a vertical line to seperate parameters)

Console.Write(FilePathAndName + "|" + PicFormArsivOK.ToString() + "|" + TarayiciFormArsivOK.ToString());

and finally i read values from result value like this:

 if (result.Split('|').First() != "" && (Convert.ToBoolean(result.Split('|')[1]) == true | Convert.ToBoolean(result.Split('|')[2]) == true))
        {
          //TODO:  
        }

I hope you got the idea here and the answer is useful for your needs!