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i got "StartIndex cannot be less than zero.
Parameter name: startIndex" when i use "<%=text.Remove(text.LastIndexOf(','))%>" in my aspx code .as i think this is due to empty value.
Urgent help plz
Updated 11-May-22 2:49am

int backSlashIndex = text.IndexOf("\\");
domain = (backSlashIndex >= 0) ? text.Substring(0, backSlashIndex) : text;
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The error you got is pretty clear - You can not pass less than zero for an ZERO-BASED indexing scenarios.

And I think as no string ',' is found LastIndexOf is giving -1[^]

Try checking this -1 return and handle accordingly.
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