Convert to uppercase(Capital Letter)

In my code I want to convert a CString to uppercase,if it is in lowercase.

Code:

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CString nName;
m_cmdtxt.GetWindowText(nName);

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The user entered nName to be in Uppercase only when am processing to my project.

From MSDN, I have seen ToUpper() will do it.... But how??

Plz solve it with its source code format..thanking u..

From MSDN:
CString::MakeUpper