Null data con't return in DataAccessLayer in ASP.NET with C# code

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C#

DataAccessLayer:

public string  REPEATED_NAME (Add_SupplierPL obj)
        {

            string  str = "SELECT S_NAME FROM SUPPLIER WITH (NOLOCK) WHERE UNIT='" + obj.UNIT + "' AND COMPANY='"+ obj.COMPANY +"' AND S_NAME='" + obj.SUPPLIERNAME + "'";
            obj.SUPPLIERNAME = SqlHelper.ExecuteScalar(SqlCon, CommandType.Text, str).ToString();
           if(obj.SUPPLIERNAME=="")
            {
                return "0";
            }
            else
            {
                return obj.SUPPLIERNAME;
            }
}

the error is"Object reference not set to an instance of an object",
it can't return the null data plz hlep me,,

Posted 26-Oct-13 18:01pm

Member 9959371

Updated 27-Oct-13 3:30am

v4

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Mahesh Bailwal 27-Oct-13 2:40am

what error are you getting?

Member 9959371 27-Oct-13 9:29am

I was getting error "Object reference not set to an instance of an object"

1 solution

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Mehdi Gholam · Answer 1 · 2013-10-26T21:00:00

Solution 1

Do the following:

C#

obj.SUPPLIERNAME = "" + SqlHelper.ExecuteScalar(SqlCon, CommandType.Text, str);

Posted 26-Oct-13 21:00pm

Mehdi Gholam

Comments

Member 9959371 27-Oct-13 9:22am

it does not work,, thowr the same error,,plz send me correct code

Mehdi Gholam 27-Oct-13 9:25am

Put a breakpoint on your code and see where you are getting the null.

Member 9959371 27-Oct-13 9:34am

iam using to breskpoint in that code,, the error is "Object reference not set to an instance of an object"

Mehdi Gholam 27-Oct-13 9:35am

Which object is null?

Member 9959371 27-Oct-13 9:40am

the object is enter the data in presentationlayer(textbox),is null data,, plz ,corrct code send me

Mehdi Gholam 27-Oct-13 9:50am

I don't see any textbox in your code.

Member 9959371 27-Oct-13 9:57am

it error occur in dataAccessLayer(DAL),,so ,iam not mention presentationlayer code,.when enter textbox data ,it will compare data to the DATABASE.

Mehdi Gholam 27-Oct-13 11:26am

Debug your application where you are getting the exception, mouse your mouse over the line until you see the watch tooltip and see which object is null.