Length cannot be less than zero. Parameter name: length

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C#

protected void asd_Click(object sender, EventArgs e)
        {
            if (Common.Common.ApplicationInformation.LoggedInUser.RGroupIds != null)
            {
                string Documentid = string.Empty;
                string GroupIds = string.Empty;
                string DocumentIds = string.Empty;
                string ContactIds = string.Empty;
                //----------------
                if (Session["ReportDocumentIDs"].ToString() != null)
                {
                    DocumentIds = Session["ReportDocumentIDs"].ToString();
                    Documentid = DocumentIds.Substring(0, DocumentIds.LastIndexOf(','));
                }
                else
                {
                    Documentid = null;
                }

In the bold line i got the error ,plz some one help me .urgent

Posted 8-Jun-15 20:39pm

Sambit_Sahoo

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kashif Atiq · Answer 1 · 2015-06-08T21:38:00

Solution 1

This might be due to the line

DocumentIds.LastIndexOf(',')

check that is there any "," in your decumentids string?

you can check

if(DocumentIds.Contains(","))
  Documentid = DocumentIds.Substring(0, DocumentIds.LastIndexOf(','));
else
  // some code here

Posted 8-Jun-15 21:38pm

kashif Atiq

Updated 8-Jun-15 21:41pm

v2