Problem with Bindind combobox and SelectedIndex Changed

[Pramod Goutham]

Hi,

Whenever I bind my radcomboxbox with a table in the dataset, the SelectedIndex Changed event gets fired automatically, causing exceptions in my winform, since I'm writing the SelectedIndex Changed event to retrieve some more data from the DB based on the value of the item selected in the radcombo box.

The code I have written is as below:

DataSet mydataset = helperObj.GetData();
radcombobox1.DataSource = mydataset.Tables[0];
radcombobox1.Text = "Please Select";

How can I avoid the event from being fired?

Thanks and Regards,
Pramod Goutham.

[Vassil Petev]

Hi Pramod Goutham,

Indeed, this is an issue that will be addressed soon. Thank you for reporting it.


Best wishes,
Vassil
the Telerik team

Check out Telerik Trainer, the state of the art learning tool for Telerik products.

[Marcus Eddy]

The only way I found to get around this is subscribe and unsubscribe to the SelectedIndexChanged event programmatically before and after databinding, this way I had control over this event and could circumvent the inbuilt method calls.

[Nick]

Thank you for sharing with the community your work-around, Marcus Eddy.

Best wishes,
Nick
the Telerik team

Check out Telerik Trainer, the state of the art learning tool for Telerik products.

[Diederik]

Hi,

Is this problem solved in the 2009 Q1SP1 release? I am trying to bind a list of custom objects and the SelectedIndexChanged event triggers automatically.

Best regards.

[Peter]

Hello Diederik,

This bug is not fixed yet and you should use the workaround from Marcus Eddy.

Please, excuse us for the inconvenience. The issue is logged in our TODO list and it will be addressed in some of the next releases. Don't hesitate to contact us if you have other questions.

Sincerely yours,
Peter
the Telerik team

Instantly find answers to your questions on the new Telerik Support Portal.
Check out the tips for optimizing your support resource searches.

[southwynd]

I'm having this same issue.  I want to populate a RadGridView, but only after selecting an item from the RadComboBox  I've attempted to remove/add the SelectedIndexChanged event like this:

    Private Sub ddlProtocols_ItemDataBound(ByVal sender As Object, ByVal e As ItemDataBoundEventArgs) Handles ddlProtocols.ItemDataBound
        AddHandler ddlProtocols.SelectedIndexChanged, AddressOf ddlProtocols_SelectedIndexChanged

        ' My code here for formatting RadComboBoxItem tags

        RemoveHandler ddlProtocols.SelectedIndexChanged, AddressOf ddlProtocols_SelectedIndexChanged
    End Sub

And then populate my RadGridView like this:

    Private Sub ddlProtocols_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ddlProtocols.SelectedIndexChanged
        ' My code here for populating the RadGridView
    End Sub

But the SelectedIndexChanged continues to fire multiple times before I've selected an item from the RadComboBox.  Any ideas on how I can get this workaround to work?

[Peter]

Hello southwynd,

Thank you for writing. You should unsubscribe from the event before the databinging and subscribe after that. Please, refer to the code snippet:
 

RemoveHandler ddlProtocols.SelectedIndexChanged, AddressOf ddlProtocols_SelectedIndexChanged

me.radGridView1.DataSource = table1

AddHandler ddlProtocols.SelectedIndexChanged, AddressOf ddlProtocols_SelectedIndexChanged

Hope this helps.

Kind regards,
Peter
the Telerik team

Instantly find answers to your questions on the new Telerik Support Portal.
Watch a video on how to optimize your support resource searches and check out more tips on the blogs.