while processing file from source to destination using prss?

public string submitFile(string SourceFilePath, string CWID, string SystemName, string destFileName, string fileType)
{
string strresult = "";
try
{
string strDestPath = _configurationManager.AppSettings["Attachmentpath"];
if (SystemName.Trim() == "xvalue")
{
string BatfilePath = _configurationManager.AppSettings["BatFilePath"];

if (File.Exists(SourceFilePath))
{
destFileName = destFileName.Replace("\"", "");
string DestinationFilePath = "\"" + strDestPath + "\\" + CWID + "_" + destFileName + "." + fileType + "\"";
System.Diagnostics.Process process = new System.Diagnostics.Process();

process.StartInfo.FileName = BatfilePath + "Unzip.bat";
process.StartInfo.UseShellExecute = false;

//here maping sourec and destination paths like below :-
//SourceFilePath = D:\Data\CWAttachment\test.txt
//DestinationFilePath; D:\RetValue\CWAttachment\cW123_test.txt

process.StartInfo.Arguments = SourceFilePath + "\t" + DestinationFilePath;

process.Start();//this place i am getting an error
process.WaitForExit();
strresult = "Processed";
}
else
{

strresult = "FileNotFound";
}

}
}
catch (Exception ex)
{
//Log.Error("Error occured while submitFile an CWAttachmentInfo ", ex);
}
return strresult;
}