Dynamic Date Picker On grid view...

$(".datagrid-row").each(function(index, element){
var id = $(this).attr("id");
  var dates = $("#"+id+" .StartDatetext, #"+id+" .EndDatetext").datepicker({
              minDate: '0',
              maxDate: '10000D',
              dateFormat: "MM dd yy",
              onSelect: function (selectedDate) {
                  var option = this.id == ".EndDatetext" ? "maxDate" : "minDate",
                    instance = $(this).data("datepicker"),
                    date = $.datepicker.parseDate(
                        instance.settings.dateFormat ||
                        $.datepicker._defaults.dateFormat,
                       selectedDate, instance.settings);

                  var odate = date;
                  if (this.id == "StartDatetext") {
                      odate.setDate(odate.getDate() + 1);
                  }
                  dates.not('.StartDatetext').datepicker("option", option, odate);
              }
          });
       });

Dynamic Date picker In Jqurey

 $(function () {
          var dates = $(".StartDtaeText, .EndDateText").datepicker({
              minDate: '0',
              maxDate: '100D',
              onSelect: function (selectedDate) {
                  var option = this.id == ".EndDateText" ? "maxDate" : "minDate",
                    instance = $(this).data("datepicker"),
                    date = $.datepicker.parseDate(
                        instance.settings.dateFormat ||
                        $.datepicker._defaults.dateFormat,
                        selectedDate, instance.settings);
                  //alert(this);
                  dates.not('.StartDtaeText').datepicker("option", option, date);
              }
          });

Can I use CASE statement in a JOIN condition?

A CASE expression returns a value from the THEN portion of the clause.

You could use it thusly: 

SELECT  * 
FROM    sys.indexes i 
    JOIN sys.partitions p 
        ON i.index_id = p.index_id  
    JOIN sys.allocation_units a 
        ON CASE 
           WHEN a.type IN (1, 3) AND a.container_id = p.hobt_id THEN 1
           WHEN a.type IN (2) AND a.container_id = p.partition_id THEN 1
           ELSE 0
           END = 1

Stop page post back action

 if (!IsPostBack)
            {
                ViewState["postids"] = System.Guid.NewGuid().ToString();
                Session["postid"] = ViewState["postids"].ToString();
            }
            else
            {
                if (ViewState["postids"].ToString() != Session["postid"].ToString())
                {
                    IsPageRefresh = true;
                }
                Session["postid"] = System.Guid.NewGuid().ToString();
                ViewState["postids"] = Session["postid"].ToString();
            }