System.ArgumentOutOfRangeException: startIndex cannot be larger than length of string

Question

I have this code. I am trying to retrieve just the text \"first program\". Considering that i know the index say 25 and total length of string is 35.

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Answer 1

Second argument for SubString is the number of characters in the substring.

Simpler way to do it.

int startIndex = 25; // find out startIndex
int endIndex = 35;   // find out endIndex, in this case it is text.Length;
int length = endIndex - startIndex; // always subtract startIndex from the position wherever you want your substring to end i.e. endIndex

// call substring
Response.Write(text.Substring(startIndex,length));     

you can do some operation or call a function to get start/end index values. With this approach you are less likely to get into any trouble related to indexes.