c# - how to remove file format using substring -

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i struggling understand how substring works in c#. how use substring in c# remove file format?

from :

test.xml

to:

test

although path.getfilenamewithoutextension normal way it, can substring. first have find period.

string name = "test.xml"; int pos = name.lastindexof('.'); if (pos >= 0) {     name = name.substring(0, pos); }

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