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C# Object reference not set to an instance of an object.

I have a page that seems to be coded properly, however every now and than I get the error below.
That is wrong with line 66 I don't get it.

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Object reference not set to an instance of an object.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.

Source Error:

Line 64: BAL_Core cor = new BAL_Core();
Line 65: DataSet ds = cor.Get_WO(field, uid, DAL_Core.filter);
Line 66: int dscount = ds.Tables.Count;
Line 67: if (dscount > 0)
Line 68: {

Source File: d:\wwwroot\MOC2\wo.aspx.cs Line: 66

Sathish DV

hi,
can u add code for Get_WO(field, uid, DAL_Core.filter). Need to see any thing is missing from initialization?

Andrew Crofts

If there is a problem with line 65, ie cor.Get_WO doesn't actually return a dataset line 66 will give the error you report.

You should look at why a ds might not be returned.

You could test ds to see if it is null/nothing before trying to use it

gery128

Check if you are passing valid values to BAL function Get_WO and if its returning proper dataset by filling it with data. Your dataset seems to be null.

tbsolutions

Try this:

if(ds != null && ds.Tables != null)
     int dscount = ds.Tables.Count;

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Hope it helps.
Boccio

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I found the problem.