CStdString strName = _T("Bob"); int nAge = 30; CStdString strFormatted; strFormatted.Format(_T("%s is %d years old"), (LPCTSTR)strName, nAge);In this example, we declare a CStdString object called `strName` and set it to the value "Bob". We also declare an integer variable called `nAge` and set it to 30. We then declare another CStdString object called `strFormatted` and use the `Format` function to format a string that includes `strName` and `nAge`. The `%s` and `%d` are placeholders for variables that are passed as arguments to the `Format` function. Overall, CStdString Format is a useful library for formatting text strings in C++. It is commonly used in Windows-based applications developed using the MFC library.