Wpf how to set tooltip

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Hi I am trying to set a tooltip to a textbox progamatically,but i am keep getting the error:

An exception of type 'System.NullReferenceException' occurred in e-Learning.exe but was not handled in user code
The error :Object reference not set to an instance of an object.

the code:

C#

ToolTip tt = new ToolTip();
            tt.Content="Introduceti adresa URL a videocipului";
             loca.ToolTip = tt;

any ideas how can i set the tooltip ?
I am sorry if i wasn't clearly enough.
P.S "loca" is the name of the textbox

Posted 15-May-15 1:18am

SGS97

Updated 15-May-15 2:00am

Herman<T>.Instance

v3

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Herman<T>.Instance 15-May-15 8:01am

who is null? Did you debug that?

SGS97 15-May-15 8:06am

loca is null

Matt T Heffron 15-May-15 20:18pm

So use "Improve question" and show us how you set the value of loca.
That's pretty clearly where this problem lies.

2 solutions

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Praveen Raghuvanshi · Answer 1 · 2015-05-15T02:39:00

Solution 1

Why don't you set the tool tip in XAML?
Refer this http://wpftutorial.net/ToolTip.html[^]

Posted 15-May-15 2:39am

Praveen Raghuvanshi

Comments

SGS97 15-May-15 8:57am

well, i need to change the tooltip text depending on the selection the users make,
the problem is that loca("name of the textbox") loca value is null

MarkWardell · Answer 2 · 2015-05-15T13:07:00

Solution 2

Okay
if (loca != null)
{
ToolTip tt = new ToolTip();
tt.Content="Introduceti adresa URL a videocipului";
loca.ToolTip = tt;
}

Posted 15-May-15 13:07pm

MarkWardell