error in using listbox when clicking button

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i having a listbox and button .when i click button if the listbox item got selected it should navigate to another page

i used this code

C#

var ls=listBox1.SelectedItem.ToString();
         if (ls=="")
         {
             MessageBox.Show("select salesmanname").ToString();

         }
         else
         {
             NavigationService.Navigate(new Uri("/customernames.xaml", UriKind.Relative));
         }

but i am getting null point exception

Posted 31-May-14 1:42am

Nandhini Devi

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[no name] 31-May-14 7:50am

Debug your code and find out where you are getting this "null point exception".

What are you trying to do with "MessageBox.Show("select salesmanname").ToString();"?

Nandhini Devi 31-May-14 7:56am

near var ls=listboxitem...

Nandhini Devi 31-May-14 8:02am

if user dnt select list then message box should be displayed

[no name] 31-May-14 8:15am

Okay and what is the purpose of the ToString() there?

[no name] 31-May-14 8:16am

Debug your code and find out exactly where you are getting that exception. Then you can fix it. "Near" is not good enough.

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**HardikPatel.SE** · Answer 1 · 2014-05-31T02:24:00

Solution 1

Try this :

C#

var ls = listBox1.Text;

in place of

C#

var ls=listBox1.SelectedItem.ToString();

:):):)

Posted 31-May-14 2:24am

HardikPatel.SE

Comments

Nandhini Devi 31-May-14 8:38am

i am using it for windows phone and listbox1.text not coming

HardikPatel.SE 31-May-14 8:48am

then try this :
ListBox1.SelectedValue.ToString();

HardikPatel.SE 31-May-14 8:49am

listBox1.SelectedItem.ToString();

listBox1.SelectedValue.ToString();

Nandhini Devi 31-May-14 9:23am

still error null reference exception

Nandhini Devi 1-Jun-14 1:19am

any other option to erradicate this error ?