how to check the checkbox inside listview when data is bind to the listview from database in wpf

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hi
i am having checkbox inside listview and i am binding data to that listview from database.
what i want now is when the data is bind to the listview i want the checkbox to be checked
.for that i try to refer the checkbox in the button event and make the checkbox checked but
it will display an error message null reference exception object reference not set to instance
of an object

here is my code in the button click event

C#

CheckBox myTextbox = GetTemplateChild("chb_standard") as CheckBox;
                  
                        myTextbox.IsChecked = true;
                    
if any one have any idea help  me thanks in advance.

Posted 5-Sep-13 19:32pm

prabhakar78

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Marvin Ma · Answer 1 · 2013-09-05T20:30:00

Solution 1

Would be easier to bind the IsChecked property to a public property to handle this situation.

For example:

C#

private bool _cbIsChecked;

C#

public bool CbIsChecked
{
     get{return _cbIsChecked;}
     set{_cbIsChecked = value;}
}

Then you should define a method where this property is been set.

Don't forget to implement the INotifyPropertyChanged, so the UI refreshes itself.
Raise it in the set of the public property.

For any further questions, just ask.

Hope it helps :)

Posted 5-Sep-13 20:30pm

Marvin Ma

Comments

prabhakar78 6-Sep-13 2:46am

thanks for your help . my problem is once the items is bind to the listview from database
i want the checkbox in the listview to be checked i am write it in the code like this

for (int k = 0; k <= listView1.Items.Count - 1; k++)
{
ListViewData lvc = (ListViewData)listView1.Items[k];

CheckBox myTextbox = GetTemplateChild("chb_standard") as CheckBox;
mytextbox.ischecked =true;

i did exactly like this but it will display objectnullreferenceexecption if any idea help me

}

Marvin Ma 6-Sep-13 2:57am

For understanding: You have a text box in the column header and want it to be checked if the data from database were loaded succesfully?

Let me know if I'm right.

prabhakar78 6-Sep-13 3:05am

yes you are right .but i want it to do it in coding for some reason.

Marvin Ma 6-Sep-13 3:14am

Is there a check box in each row of the table?

prabhakar78 6-Sep-13 3:17am

yes

Marvin Ma 6-Sep-13 3:23am

You could have a look at this article:
http://wpf-mettyz.blogspot.de/2012/01/datagrid-with-datagridcheckboxcolumn.html

It explains how to check all check boxes with the one in the header, so you could set this one in code and all rows with data will be checked, too.

Got what I'm trying to explain?

prabhakar78 6-Sep-13 3:25am

ok i got it thanks

Pheonyx 6-Sep-13 9:06am

You have reposted this question.. so I ask you, did the advise you were trying to follow here not work? If so what about it did not work?