Retrieve the ID of a specific row

[Rosco]

I am trying to implement drag and drop functionality for a single RadGrid. My RadGrid is bound as follows:

       private void RetrieveData()
        {
            ////first retrieve projects
            List<UIProject> projects = RetrieveProjects();

            projects.ForEach(a =>
            {
                a.Features = (from u in Helper.DataContextFromWeb.MagUserstories
                              where u.MagProjectId == a.ProjectId && u.Statuscode == 1
                              orderby u.MagTitle
                              select new UIFeature
                              {
                                  FeatureId = u.MagUserstoryId,
                                  FeatureName = u.MagTitle
                              }).ToList();

                a.Features.ForEach(b =>
                {
                    b.Tasks = (from t in Helper.DataContextFromWeb.MagTasks
                               where t.MagUserStoryId == b.FeatureId && t.Statuscode == 1
                               orderby t.MagTitle
                               select new UITask
                               {
                                   TaskName = t.MagTitle,
                                   ActualHours = t.MagActualTime,
                                   EstimatedHours = t.MagEstimatedTime,
                                   //Status =
                                   //Owner =
                               }).ToList();
                });
            });

            BindMasterBackLog(projects);
        }

        private void BindMasterBackLog(List<UIProject> projects)
        {
            this.masterbacklog.DataSource = projects;
            this.masterbacklog.DataMember = MagProject.Fields.MagProjectId;
            this.masterbacklog.DataBind();
        }

Data is retrieved from Microsoft Dynamics CRM and displayed in the grid correctly. Now, I am trying to implement the server-side onRowDrop event handler. The line below is giving me an "Index was out of range. Must be non-negative and less than the size of the collection" error. Could this be due to the way that I have bound the RadGrid? Please help.

UIProject project = RetrieveProject(projects, (Guid)e.DestDataItem.GetDataKeyValue("ProjectId"));

[Radoslav]

Hello Rosco,

The described error is thrown when the MasterTableView.DataKeyNames property is not set. Could you please verify that you set the MasterTableView.DataKeyNames to the "ProjectId"?
Also please check out the following online example which demonstrates the RadGrid's Items Drag-and-drop:
http://demos.telerik.com/aspnet-ajax/grid/examples/programming/draganddrop/defaultcs.aspx

Additionally regarding you question about RadGrid data binding:

Simple data-binding can be used in simple cases when you do not require the grid to perform complex operations. For advanced features, RadGrid must be bound using declarative data sources or through the NeedDataSource event.

Best wishes,
Radoslav
the Telerik team

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