folder - Writing to a subfolder in c# -

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I have trouble writing a text file in a folder, which I tried to create. He said that I do not have access to 'C: \'

Can anyone tell me how to fix this and how? Thanks! string file_name = Environment.CurrentDirectory; File_name + = @ "\."; File_name = (string) kababox 1. Selected value; File_name + = @ "\."; File_name + = (wire) combobox2.SelectedValue; TextWriter name = new streamer (file_name); Edit

Edit: New code after modifications ... 

  var location = path. Cobine (environment. Current directory, (string) combobox1. Selected item); Directory.CreateDirectory (location); Var path = path Cobain (location, combobox 2. selected ingots); TextWriter name = new streamer (path, true);   
 My goal is \\. Txt  
 Write a text file can someone tell me how? Thanks!   
 
 
 The solution is that what the others have said.  
 As already mentioned, this line:  
  file_name = (string) combobox1. Selected value;   
 An assignment ( = ) is incorrectly done instead of an assembly ( + = ). This means that if  comboxbo1 The selected value is   null , your way . , which is the root directory of the drive.  
 You must remember that it is legal for  SelectedValue  for  null , because there can be an empty selection in a combo box, in that case To handle, perhaps disabling your saved functionality until the combo box has valid selection.  
 This is actually not a problem with permissions; It is not possible that you really want to write in the root directory or the root directory, which is why you are not allowed in the first place.

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