[SOLVED]The specified executable is not a valid application for this OS platform

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C#

I have created an Editor. In That editor i am calling WriteLog Method, Which is hard coded in my program, with some string value. There is Button for With Compile Your Program Text. On that Click I am trying to save a file with name Variable.cs. Than From my code I am Calling C# Compiler at the same time to produce result.


This Is My Code to Save File

private void SaveCSFile()
        {
            MyCSFile = string.Empty;
            //---------------------------Class Declaration-----------------------------//
            MyCSFile = @"using System;
            class Variable"
            + "{";
            MyCSFile += ConvertGrid(dataGridView1);
            MyCSFile += ConvertGrid(dataGridView2);
            MyCSFile += @"public Variable()" +
                "{";
                   MyCSFile+= T2.Text +
                "}";
            MyCSFile += @"public void WriteLog(String Msg)
                    {
                         Console.WriteLine(Msg);
                        Console.ReadLine();
                    }
                     public string toString(string msg)
                     {
                        return msg.ToString();
                     }
                    }";

            //-------------------------------------------------------------Declaring Main Method-----------------//
            MyCSFile += @"class MainClass
                          {";
             MyCSFile+=@"static void Main()" + "\n" +
                        "{";
             MyCSFile += @"Variable v=new Variable();";
            //MyCSFile += "v."+ConvertTab(tabControl3.SelectedTab.Text) + "\n";
             MyCSFile += "v."+T1.Text+ "\n";
            MyCSFile += "}}";
           MessageBox.Show(MyCSFile);
           //-----------------------------Writing CS File---------------------------//

           writer = System.IO.File.CreateText(FilePath);
           writer.WriteLine(MyCSFile.Trim()+System.Environment.NewLine);
           writer.Close();

        }

This The Code Where I am Calling C# Compiler And Passing the Source File

private void GenerateScript()
        {
            SaveCSFile();
            //string AppName="demoFile.exe";
            string AppName = tabControl3.SelectedTab.Text + ".exe";
            
            //string mainClass="HelloWorld";
            string mainClass = tabControl3.SelectedTab.Text;

            CSharpCodeProvider code = new CSharpCodeProvider();
            ICodeCompiler compiler = code.CreateCompiler();
            CompilerParameters param = new CompilerParameters();
            //param.GenerateExecutable = true;
            param.GenerateInMemory = true;
            param.OutputAssembly = AppName.ToString();
            param.MainClass = mainClass.ToString();
            foreach (Assembly asm in AppDomain.CurrentDomain.GetAssemblies())
            {
                param.ReferencedAssemblies.Add(asm.Location);                
            }
            string Mycode = MyCSFile ;
            //CompilerResults result = compiler.CompileAssemblyFromSource(param, Mycode);
            CompilerResults result = compiler.CompileAssemblyFromFile(param, "Variable.cs");
            if (result.Errors.Count > 0)
            {
                string error = "Compilation error :\n";
                foreach (CompilerError err in result.Errors)
                {
                    error += err.ErrorText+" "+"In Line Number :"+err.Line +" ";
                   
                }
                MessageBox.Show(this, error, "Error");                
            }
            else
            {
                #region Try to ExecuteApplication
                try
                {
                    if (!System.IO.File.Exists(AppName))
                    {
                        MessageBox.Show("FileName" + AppName + " Not Found");
                        return;
                    }
                    
                    ProcessStartInfo pinfo = new ProcessStartInfo
                    {
                         FileName = AppName,
                        Arguments = FilePath,
                        UseShellExecute=false
                    };
                    Process.Start(AppName, FilePath);
                }
                catch (Exception ex)
                {
                    MessageBox.Show(ex.Message);
                }
                #endregion
            }
        }

here I call WriteLog Method And Passing a string value like this
WriteLog("Hello World");
Form a notepad i created.. But i am getting error every time
"The specified executable is not a valid application for this OS platform"
pls help
Thank you.....