c# - Finding an index of an element in a string array -

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I did a search on this forum to find the indicator of an element in a string array. The solution I've found uses the following method:

Array.IndexOf

I am new to C # and I have not yet heard about this method. I can find an indicator for integer, however I am struggling to find a solution for string type array.

Here is the code that I search for indicator for integers: 

  Public int search (int test value) {int i = 0; While (i & lt; test.Length & testValue! = Test [i]) i ++; If (i == test.Length) i = -1; Return i; }   
 How do I modify above, to be able to use for string type array, or any other simple method that will do the trick?   
 
 
 I think, you need the following example. If you need another example or need another solution, let me know.  
  string [vals = {"val1", "val2", "val3"}; Int idx = array.indexoff (wall, "vel 2");

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