start index error in asp.net

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string _fAppContent = System.Text.Encoding.UTF7.GetString(_appBuffer);
_fAppContent =_fAppContent.Substring(_fAppContent.IndexOf("<html>"))
this is my code and i am getting an error
startindex cannot be less than zero

Posted 1-Nov-12 0:23am

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jim lahey · Answer 1 · 2012-11-01T00:27:00

string.IndexOf will return -1 if it can't find the string you're looking for, so this call:

C#

_fAppContent.IndexOf("<html>")

Is returning -1 because it can't find "<html>". Check that _appBuffer actually contains something, that _fAppContent actually contains something and that the search string you pass to IndexOf is in the correct case.

nikhilkhoda · Answer 2 · 2012-11-01T00:49:00

Check the if condition before Substring as below

string _fAppContent = System.Text.Encoding.UTF7.GetString(_appBuffer);
if (_fAppContent.IndexOf("<html>") >= 0)
{
   _fAppContent = _fAppContent.Substring(_fAppContent.IndexOf("<html>"));
}

so that if matching string is not found then Substring would not give you error.

start index error in asp.net

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