C# not recognizing my variable -

i'm trying load code exe file create new .exe file. it's not recognizing variable "sourcecode". says name "sourcecode" not exist in current context

     private void button1_click(object sender, eventargs e)     {          using (filestream sourcecode = new filestream("thecode.exe", filemode.open, fileaccess.readwrite, fileshare.none));         string output = textbox3.text;         string[] assembly = { "system.dll", "system.drawing.dll", "system.windows.forms.dll" };         codedomprovider codecompiler = codedomprovider.createprovider("csharp");         compilerparameters parameters = new compilerparameters(assembly, "");          parameters.outputassembly = output;         parameters.generateexecutable = true;         parameters.generateinmemory = false;         parameters.warninglevel = 3;         parameters.treatwarningsaserrors = true;         parameters.compileroptions = "/optimize+ /target:winexe";         string errors = null;         try         {             compilerresults results = null;             results = codecompiler.compileassemblyfromsource(parameters, sourcecode); //this here giving me error             if (results.errors.count > 0)             {                 errors = "";                 foreach (system.codedom.compiler.compilererror compileerror in results.errors)                 {                     errors += "line number " + compileerror.line + ", error number: " + compileerror.errornumber + ", '" + compileerror.errortext + ";\r\n\r\n";                 } 

the following line ending semicolon ';'

using (filestream sourcecode = new filestream("thecode.exe", filemode.open, fileaccess.readwrite, fileshare.none)); 

in c# semicolon statement terminator rather line terminator. should declare using statements this

using(var bar = new foo()) { } 

thus making code:

using (filestream sourcecode = new filestream("thecode.exe", filemode.open, fileaccess.readwrite, fileshare.none)) { }