How Do I Perform Search Based On The Right Datatype

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.NET

pretty new to programming, i'm building a webpage using MVC.net nhibernate,in my controller i'm using FormCollection fm object and jquery datatable. my problem is that i have a text box search which should search for data inside my data table as attached in the photo, im able to search for any string but i cant search for amount or date,someone asked me to use Tryparse but i dont understand why do i need it and what should i parse exactly?it has an if and else i have no idea what to write in them i attached also some of the code that can search for string as below :

if (!string.IsNullOrEmpty(fm["SearchValue"]) && !string.IsNullOrEmpty(fm["SearchType"]))
                            {
                                criteria.Add(Restrictions.Like(fm["SearchType"], "%" + fm["MobileNo"] + "%"));