How handle zero index exception when string is empty and not containing any seprator

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i am using this to remove ',' and its working fine and i am using str as global variable but i get error if string is empty so how to handle error when i cal global variable in aspx page.

string _str = text.Remove(text.LastIndexOf(','));

Posted 1-Feb-12 21:04pm

sharad_sharma82

Updated 1-Feb-12 21:07pm

Rajesh Anuhya

v2

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Sergey Alexandrovich Kryukov 2-Feb-12 3:06am

What global variable are you talking about? There are no global variables in C#.
--SA

Sergey Alexandrovich Kryukov 2-Feb-12 3:06am

What is "call a variable"? There is no such thing.
--SA

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Abhinav S · Answer 1 · 2012-02-01T21:07:00

Solution 1

There could be a number of ways to do this.

You could just do this

<br />
if text.length > 0 && text.Contains(',')<br />
string _str = text.Remove(text.LastIndexOf(','));

Another approach could be to club the if statement in the same line
string _str = text.Length>0 && text.Contains(',')?text.Remove(text.LastIndexOf(',')):String.Empty;

Posted 1-Feb-12 21:07pm

Abhinav S

Updated 1-Feb-12 21:12pm

v2

Comments

Sergey Alexandrovich Kryukov 2-Feb-12 3:23am

Same thing in more detail, could be useful for the OP (who is apparently too weak), so my 5.
--SA

Abhinav S 2-Feb-12 3:26am

Thank you.

Sergey Alexandrovich Kryukov · Answer 2 · 2012-02-01T21:10:00

Solution 2

First, you do not "call" any variables, and you don't have any global variables.

If you have a problem with null string, you can always check if (text == null) … or if (string.IsNullOrEmpty(text)) …

—SA

Posted 1-Feb-12 21:10pm

Sergey Alexandrovich Kryukov

Comments

Abhinav S 2-Feb-12 3:12am

String.Empty will throw an error as well so IsNullOrEmpty is the best option. My 5.
I've checked for , as well - otherwise OP will still get an error.

Sergey Alexandrovich Kryukov 2-Feb-12 3:22am

Great. Thank you for your confirmation and your vote.
--SA

sharad_sharma82 · Answer 3 · 2012-02-01T21:55:00

b = dtsubstancename.Rows[i]["Subs_name"].ToString() + "," + b;

if (b != "")
{
int backSlashIndex = b.IndexOf(",");
weaklypositive = (backSlashIndex >= 0) ? b.Remove(b.LastIndexOf(',')) : b;

lblwp.Visible = true;
lblrwp.Visible = true;

}

How handle zero index exception when string is empty and not containing any seprator

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