How to code to choose latest time?

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Visual-Studio

MVC

C#3.5

Hi, i have three attributes of datetime: Time_start, Time_fail, Time_pass.

i want to get information between two date.

so in view, i will ask for datestart and dateEnd to get the date interval, and compare with the Time_Start

then, between three date, i want to choose the latest date to display. how to i code that?

What I have tried:

in view, i ask for date in textbox like this:

<div class="form-group">
                                           @Html.TextBox("DateStart", "", new { @class = "date-picker form-control", @placeholder = "Date Start", @autocomplete = "off" })
                                       </div>
                                       <div class="form-group">
                                           @Html.TextBox("DateEnd", "", new { @class = "date-picker form-control", @placeholder = "Date End", style = "visibility: visible !important" })

                                       </div>
                                       <button type="submit" value="Search" class="btn btn-primary">Search</button>

in controller:

public ActionResult TesterPerformance(DateTime DateStart, DateTime DateEnd)
       {
        var selectdate = (from c in db.Information
                           where c.Time_start >= DateStart && c.Time_start <= DateEnd
                           select new DetailBundle
                           {
                               Time_start = c.Time_start,
                               Time_fail = c.Time_fail,
                               Time_pass = c.Time_pass
                           }).ToList();
           ViewBag.datepick = selectdate;
           return View();

now, i'm missing the part to compare the latest date to view and i did not have any idea to code that.

using this code also i got error as it says "

The parameters dictionary contains a null entry for parameter 'DateStart' of non-nullable type 'System.DateTime' for method 'System.Web.Mvc.ActionResult TesterPerformance(System.DateTime, System.DateTime)' in 'StorageHost.Controllers.HomeController'. An optional parameter must be a reference type, a nullable type, or be declared as an optional parameter.

"

please guide me through this as i'm still new with c# projects. thank you