Can someone tell me whats wrong with this C# statement?

using Excel = Microsoft.Office.Interop.Excel;





I have seen it used, I know its supost to work but I dont know what its doing or what reference I need to add to use it.

Can someone tell me whats wrong with this C# statement?
check the version of MS Office running on your system and on that system where this line worked well


or


try to add microsoft.office.core.dll in references

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