How to change the file extension to upper case in c#?

I am generating PDF Files with the extension "pdf" in small letters and requirement is to change it to PDF (All in upper case).  When I generate the files and debug, it shows the intended output and after generating it again displays the same lower case extension.
I have 34 files in the folder and it does change the file for only three files and rest of them lower case.
Can anyone please guide me how to resolve this issue?
here is my code:
 FormName = "Form" + form + ".PDF";
fsOutput = new FileStream(TemplatePath + FormName, FileMode.Create,                                                  FileAccess.Write);
objDoc.Generate(fsoutput);

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developer2012Asked:
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Miguel OzSoftware EngineerCommented:
Two alternatives:
A1. use an invariant string:
FormName = String.Format(CultureInfo.CurrentCulture, "Form{0}.PDF", form);

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A2. Use the ToUpperInvariantmethod
string[] files = Directory.GetFiles("your dir", "*.pdf");
foreach(string file in files)
{        
    System.IO.File.Move(file, file.ToLowerInvariant());
}

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Note: 1) I have not tested yet as I do not have VS handy.
2) From MSDN:
If you need the lowercase or uppercase version of an operating system identifier, such as a file name, named pipe, or registry key, use the ToLowerInvariant or ToUpperInvariant methods.
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developer2012Author Commented:
The first one works for me but it displays the string as "FormForm12345.PDF" and If I modify the code to resolve it does not work
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Miguel OzSoftware EngineerCommented:
What exactly do you need?
e.g. if  form="Form12345" then FormName=  "FormForm12345.PDF" as per original code.
if you are trying to avoid duplicating word "form" just modify the format string like:
FormName = String.Format(CultureInfo.CurrentCulture, "{0}.PDF", form);

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thus, FormName=  "Form12345.PDF"
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developer2012Author Commented:
I did modify the string the same way you did and it returned me 1234.PDF as file name
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Vel EousResearch & Development ManagerCommented:
If you only want to uppercase the file extension, perhaps the following will work for you.

var formName = "Form" + form + ".PDF";
var fsOutput = new FileStream(formName, FileMode.Create, FileAccess.Write);
objDoc.Generate(fsOutput);
// close the filestream before we can work on the file it created
fsOutput.Close();
File.Move(formName, Path.ChangeExtension(formName, Path.GetExtension(formName).ToUpper())); 

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Miguel OzSoftware EngineerCommented:
What is the value of the form variable?
It seems that in your last example form=1234, if that is the case you need to use my original code.
My original String.Format code is doing two jobs:
- Creating an invariant name that you can use for your filename.
- Adding a prefix "Form" and a suffix ".PDF" to your form variable by using the format string ("Form{0}.PDF" )
I proposed that solution because the original code was (FormName = "Form" + form + ".PDF";), if your needs have changed please feel free to modify  the format string to your current needs.
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