Check out example codes for "c# remove character from string at index". It will help you in understanding the concepts better.
Code Example 1
string s = "This is string";
s = s.Remove(2, 1);
//Output: Ths is string
string s = "This is string";
s = s.Remove(2, 2);
//Output: Th is string
Code Example 2
remove char from an index of string
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