I want to take value which is manually inserted in videoid to come dynamically according to case and event

<pre> 
private void   fillLinkGraph_Video()
        {
            try
            {
                #region To Clear the data of Link Graph
                graphControl.Graph.Clear();

                //if ()
                 string _videoID = "1,2,3,4,5,6,7,8,9";
             
                {
                    //To fill datatable to bring video and event  to link chart
                  
                     string _query_case = "Select [Video_Id], [Event] from [Case_InvstVideoMaster]  where [Case_Id]='" + Value.ValueG._caseID + "' and  Video_Id in(" + _videoID + ")";
                
                    DataTable dt_object_info =bfc.fill_datatable(_query_case);

                    string eventIconpath = bfc.fill_sigle_value("Select [Icon_File_Path] from [Icon_List] where [Icon_Name] = 'Event' and [Icon_List_Name] ='Mater_Icon'") + "\\" + bfc.fill_sigle_value("Select [Icon_File_Name] from [Icon_List] where[Icon_Name] = 'Event' and[Icon_List_Name] = 'Mater_Icon'");
                    string videoIconpath = bfc.fill_sigle_value("Select [Icon_File_Path] from [Icon_List] where [Icon_Name] = 'Video' and [Icon_List_Name] ='Mater_Icon'") + "\\" + bfc.fill_sigle_value("Select [Icon_File_Name] from [Icon_List] where[Icon_Name] = 'Video' and[Icon_List_Name] = 'Mater_Icon'");
                    Dictionary<string, INode> discVideoObj = new Dictionary<string, INode>();

                    Dictionary<string, IEdge> discEdgeObj = new Dictionary<string, IEdge>();

                    for (int j = 0; j < dt_object_info.Rows.Count; j++)
                    {
                        string lbl_video = "Video" + dt_object_info.Rows[j]["Video_Id"].ToString();
                        string lbl_Event = "Event" + dt_object_info.Rows[j]["Event"].ToString();

                          
                         string lbl_edge = "edge";


                        INode obj_video = null;
                        INode obj_event = null;

                         IEdge obj_edge = null;
                        string edge_Tag = null;

                        if (discVideoObj.Count > 0)
                        {
                            if (discVideoObj.Keys.Contains(lbl_video))
                            {
                                obj_video = discVideoObj[lbl_video];
                            }
                            else
                            {
                                obj_video = yfunc.addINode_onGraph(lbl_video, videoIconpath, lbl_video, graphControl);
                                discVideoObj.Add(lbl_video, obj_video);
                            }
                            if (discVideoObj.Keys.Contains(lbl_Event))
                            {
                                obj_event = discVideoObj[lbl_Event];
                            }
                            else
                            {
                                obj_event = yfunc.addINode_onGraph(lbl_Event, eventIconpath, lbl_Event, graphControl);
                                discVideoObj.Add(lbl_Event, obj_event);
                            }
                           
                         
                            

                        }
                        else
                        {
                            obj_video = yfunc.addINode_onGraph(lbl_video, videoIconpath, lbl_video, graphControl);
                            discVideoObj.Add(lbl_video, obj_video);

                            obj_event = yfunc.addINode_onGraph(lbl_Event, eventIconpath, lbl_Event, graphControl);
                            discVideoObj.Add(lbl_Event, obj_event);
                        }

                                              
                        {


                            if(obj_video != null && obj_event != null)
                            obj_edge = yfunc.Add_edge_to_graph(graphControl, obj_video, obj_event, lbl_edge, edge_Tag);
                            //discEdgeObj.Add(lbl_edge, obj_edge);

                        }
                    }

                    yfunc.setLayouts(graphControl, "circular");
                   
                    
                }
            }

            catch (System.NullReferenceException)
            {

            }
            catch (Exception ex1)
            {

            }
        }