remove this useless assignment to local variable sonar c#

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1. Sonar: Remove this useless assignment to variable "locale" · Issue

   

2. S1481 False Positive "Remove this useless assignment to local variable

   

3. Sonar: Remove this useless assignment to variable "locale" · Issue

   

4. S1144

   

5. Sonar 代码检测常见问题及修改实例（前端JS版本二）_remove this conditional structure or edit

   

6. Why am I getting "error CS0165: Use of unassigned local variable 'n2