How remove/delete/destroy an element from an array by value in c#?

It depends on what the array contains. If it is a primitive type (e.g. int, float) its easy:

 var array = array.Where(val => val != valToRemove).ToArray();

If it is some complex type that doesn't implement an equality comparator you should compare by the value you need

  var array = array.Where(val => val.SomeProperty != valToRemove).ToArray();

EDIT AFTER COMMENT

=> is called Lambda operator (and I can understand if you don't know about it), but != is the Inequality operator and its one of the most basic operators in any programming language.

Not to waste time explaining basics, here is an example for an array of integers:

 int[] numbers = { 1, 3, 4, 9, 2 };
 int numToRemove = 4;
 numbers = numbers.Where(val => val != numToRemove).ToArray();

And an example for an array of Vector3 objects:

 Vector3[] vectors = { new Vector3(1,1,1), new Vector3(3,3,3), new Vector3(4,4,4) };
 Vector3 vectorToRemove = new Vector3(3,3,3);
 vectors = vectors.Where(val => val != vectorToRemove).ToArray();

Thx for the answer! :), I don´t understand how to make this code. Could you explain me how this work (I dont know what <= and != are doing)? It would be nice if you give an example how to do this with vector3s (or intergers).