Fix Some bytes have been replaced with the Unicode substitution character while loading file XXX.cs with Chinese Simplified (GB2312) encoding

When we use <strong>visual studio</strong> open source file or any other file, we may encounter below problem:

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<strong>File Load</strong>

<strong>Some bytes have been replaced with the Unicode substitution character while loading file XXX.cs with Chinese Simplified (GB2312) encoding. Saving the file will not preserve the original file contents.</strong>

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I search out on the web, most of the answer is like below:

Use notepad++(or any other text editer) and edited every file in the project in the end of every file there is NullNullNullNull line remove it and click ctrl+S do this to all files

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But if there are lots of files, it is difficult and tuff to do.  What's is the reason for this problem?

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