Question about trasnferring items programmatically

[Manikanta Kiran]

Hi,

I have two list boxes : available & selected values.

When I'm allowing edits , I need to pre-populate the available & selected values. So I have tried doing the transfer programmatically :

            radLstAvailable.DataSource = dataList;
            radLstAvailable.DataTextField = "Name";
            radLstAvailable.DataValueField = "ID";
            radLstAvailable.DataBind();

            if (edit)
            {
                List<Steps> steps = DataSvcClient.GetSteps();

                radLstAvailable.TransferToID = "radLstSelected";

                foreach (Step step in steps)
                {
                    RadListBoxItem lbItem = radLstAvailable.Items.Where(item => item.Value == step.ID.ToString()).FirstOrDefault();


                    if (lbItem != null)
                    {
                        if (step.Order == 0)
                            lbItem.Checked = true;

                        radLstAvailable.Transfer(lbItem, radLstAvailable, radLstSelected);
                    }
                }
            }

It is transferring the items but not removing them from available values list box. Am I missing something ?

Please advice.

Thanks
Kiran

[Genady Sergeev]

Hi Manikanta Kiran,

Please make sure that you have set the TransferMode of the source RadListBox to Move. Does the issue persist?

Kind regards,
Genady Sergeev
the Telerik team

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[Manikanta Kiran]

Genady,

Thanks,  I tried setting the 'TranserMode' to 'Move'. It did not work.

Thanks
Kiran

[Genady Sergeev]

Hi Manikanta Kiran,

I suppose that the ListBox is rebound after you have moved the items. Have you tried to move

radLstAvailable.DataSource = dataList;
radLstAvailable.DataTextField = "Name";
radLstAvailable.DataValueField = "ID";
radLstAvailable.DataBind();

inside the If(edit) conditional statement? I

I have tried to reproduce the fault in a sample project, unfortunately, no avail. I am attaching my sample project. Can you modify it in a way that reproduces the problem?

Sincerely yours,
Genady Sergeev
the Telerik team

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[Manikanta Kiran]

Thanks. I checked your project and it worked for me as  expected. I dont think the issue is with the listbox transfer method, which you demonstrated with the sample project.

I used a user control as modal popup for editing items in a rad grid. The user control has the two list boxes. I implemented the XYZ_DataBinding event handler to load the data in the edit pop-up. (Ref :  http://demos.telerik.com/aspnet-ajax/grid/examples/dataediting/usercontroleditform/defaultcs.aspx)

I realized that if  I set the datasource of the listboxes to null in the  DataBinding event handler , the transfer is working as expected. I'm not sure why the datasource needs to be set to null ?

protected void EmployeeDetails_DataBinding(object sender, System.EventArgs e)
        {
            ArrayList tocs = new ArrayList(new string[] { "Dr.", "Mr.", "Mrs.", "Ms." });

            ddlTOC.DataSource = tocs;
            ddlTOC.DataBind();

            object tocValue = DataBinder.Eval(DataItem, "TitleOfCourtesy");

            if (tocValue == DBNull.Value)
            {
                tocValue = "Mrs.";
            }
            ddlTOC.SelectedIndex = tocs.IndexOf((string)tocValue);
            ddlTOC.DataSource = null;  // WHY DO WE SET THIS TO NULL ?
        }

Thanks for your help.

Regards,
Kiran

[Genady Sergeev]

Hi Manikanta Kiran,

This is an issue specific to the RadComboBox and the RadListBox. If the DataSource is not set to null, in a later moment, the Combo/Listbox is going to be rebound. Please, excuse us for this inconvenience.

All the best,
Genady Sergeev
the Telerik team

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Watch a video on how to optimize your support resource searches and check out more tips on the blogs.