Problem with treeview having template column loosing state after postback

[kamii47]

I have a treeview which i have used extended template 

public class MyNodeTemplate : ITemplate

   {

       public string StrText { get; set; }

 

       public void InstantiateIn(Control container)

       {

           var txt = new TextBox();

           if (!String.IsNullOrEmpty(StrText))

           {

               txt.Width = new Unit(StrText.Length, UnitType.Em);

               txt.Text = StrText;

           }

           container.Controls.Add(txt);

       }

   }

I am binding it on some dropdownlist selected index change event

if (ddlTemplateSource.SelectedValue != "0")
            {
                TreeView1.Nodes.Clear();


                var lstSections =  SourceSectionBll.GetInstance.GetSourceSectionsByTemplateSourceId(Int32.Parse(ddlTemplateSource.SelectedValue));


                if (lstSections != null)
                {
                       if (obj.LstSimpleFieldSectionMappers != null &&  )
                        {
                            var tNodeChildSimpleFields = new RadTreeNode("Simple_fields_Control");

                            foreach (var objSimplefield in    obj.LstSimpleFields)
                            {
                                var tNodeChildSimpleFieldTextEntry = new RadTreeNode(objSimplefield.FieldName);
                                var tSimpleFiledLeafNode = new RadTreeNode {Expanded = true};

                                var objtemplate = new MyNodeTemplate {StrText = objSimplefield.FieldCode};
                                objtemplate.InstantiateIn(tSimpleFiledLeafNode);
                                tNodeChildSimpleFieldTextEntry.Nodes.Add(tSimpleFiledLeafNode);
                                tNodeChildSimpleFields.Nodes.Add(tNodeChildSimpleFieldTextEntry);
                            }
                            tNode.Nodes.Add(tNodeChildSimpleFields);
                        }
                        TreeView1.Nodes.Add(tNode);
                }
            }

Problem is that treeview loses text inside the textbox when there is a button click event is triggerd
Anyway i can intact the data in the text box of MyNodeTemplate template?

[kamii47]

could any body help me in it?
I am seen there is not much replies in telerik treeview forums

[Hristo Valyavicharski]

Hi,

Probably the template is recreated every time you cause postback. That's why its value is lost. You may try to store TextBox's value in session for example and restore it after the template is recreated. 

Take a look at the attached sample, it shows how to persist values over the postbacks.

Regards,
Hristo Valyavicharski
Telerik

[kamii47]

Can you help me in accordance with the sample to persist data.I wanted to avoid the session sort of saving in my scenario
Not able to map the sample with my implementation to persist the textbox data

[Hristo Valyavicharski]

Hi,

As far as I see from the pasted code you are using the standard asp.net tree view control and the standard asp.net dropdown list. Am I right?  Please open a support ticket and attach a fully runnable sample as describe in details what is the issue you have experienced with the Telerik controls. Once we manage to reproduce the observed behavior locally, we would be able to look for a solution.

Regards,
Hristo Valyavicharski
Telerik

[kamii47]

I am using the telerik tree view.Don't know if asp.net treeview supports Itemplate and instantiating .
I will show you code tomorrow for confirmation