Regarding NullReferenceException!!!!

[Prince]

Hai all,

I have a statusbar control in one form but when i am assigning text
from another form it is giving NullReferenceException.How can solve
this problem??? Thanx in advance... Looking forward for the reply...

Regards,
Krish

 

[Andrew Kirillov]

Hello



Can you describe you approach more completely? Or post some code?



Did you make your status bar as a public member? Or you made you custom
property?

 

[Prince]

hai andrew...

this is what i want to perform in form2

statusBar1.Text = "some text " + nCount;

and status bar is in public section in form1

 

[Andrew Kirillov]

Hmmm. You should check if the statusBar1 is initialized. There is nothing
more in the code, which can produce the NullReferenceException.

 

[Ignacio Machin \( .NET/ C# MVP \)]

Hi,

Post your code, NullReferenceException happen when you are trying to access
a property from an instance that is not instantiated yet, like :

trying to do like:

statusBar1.Text =" ";

before creating the instance:
statusBar1 = new StatusBar();


cheers,

 

[Prince]

Hi...

Actually I am having a statusbar in form1(from1.cs) and

in form2(form2.cs) i want to set text in statusbar of form1, please
give the code for setting the text of the statusbar in form2.

I did as follows in form2 :

form1 f1 = new form1();
f1.statusbar.text = "some text";

and i declared status bar as public in form1

But the text is not set... what is the reason???


Regards,
Krish

 

[Jianwei Sun]

Have u checked that f1.statusbar is not null before setting the text
property.

 

[Chris Dunaway]

in form2(form2.cs) i want to set text in statusbar of form1, please
give the code for setting the text of the statusbar in form2.

Is form1 already visible at this point?

I did as follows in form2 :

form1 f1 = new form1();
f1.statusbar.text = "some text";

This code will create a *new* instance of form1 and set the statusbar
text on that form and *not* on your original form. To set the text of
the statusbar on your original form, you need to pass into form2 a
reference to form1, perhaps in the constructor.