if my datatable is null value still condition true..tell me which condition i use....

Question

0.00/5 (No votes)

See more:

my code

C#

protected void Page_Load(object sender, EventArgs e)
   {
       if (!IsPostBack)
       {
           DataTable dtMax = gen.GetDataTable("SPSelectDCNMForMaxRecord");
           if (dtMax.Rows.Count > 0)
           {
               string strMaxNo = (Convert.ToInt32(dtMax.Rows[0]["maxRecord"].ToString()) + 1).ToString();
               lblDCNO.Text = strMaxNo;
           }
           else
           {
               lblDCNO.Text = "00000000001";
           }
           txtDate.Text =DateTime.Now.ToString();
           fillCustomerName();

           BindGrid();
       }

Posted 2-Jul-13 5:20am

hardikshah011

Updated 2-Jul-13 5:32am

v3

Add a Solution

Comments

Mahesh Bailwal 2-Jul-13 11:23am

Please elaborate more?

Sampath Kumar Sathiya 2-Jul-13 11:26am

Database or your datatable?

hardikshah011 2-Jul-13 11:26am

datatable

hardikshah011 2-Jul-13 11:27am

datatable get null value still the condition true..else part not work...

Mahesh Bailwal 2-Jul-13 11:47am

Did you debug it?

3 solutions

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

OriginalGriff · Answer 1 · 2013-07-02T05:44:00

Solution 1

Check for a null:

C#

DataTable dtMax = gen.GetDataTable("SPSelectDCNMForMaxRecord");
if (dtMax != null && dtMax.Rows.Count > 0)

The order is important: if you don't check for null first, you will get an exception as you have been.

Posted 2-Jul-13 5:44am

OriginalGriff

Anilkumar2vvv · Answer 2 · 2013-07-02T05:58:00

Solution 2

Hi
please check null value before checking the row count.
if(dtMax != null)

Thanks
Anil

Posted 2-Jul-13 5:58am

Anilkumar2vvv

idenizeni · Answer 3 · 2013-07-02T20:33:00

Solution 3

You may also want to check the row value isn't null

// checks the DataTable isn't null, the maxRecord valus isn't null and DataTable has rows

if (dtMax != null && dtMax.Rows.Count > 0 && dtMax.Rows[0]["maxRecord"] != null)

Posted 2-Jul-13 20:33pm

idenizeni