how to control the display of webgrid number of records based on the values passed in the web.config?

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MVC

C#5.0

SQL-Server-2012

Here My requirement is how to control page count in webgrid through the web.congig.

for example if i enter pagecount values as 5 its giving me 5 records(rows), if i pass the 10 records it is giving me 10 records to display on grid.

but i would like to do the same operation from web.config file. if i pass the same values in web.config the changes should take affect from web.config.

can anyone help me to do that?

public ActionResult BusinessSearch(string searchType, int? searchIdvalue, string searchValue, int pidx = 1)
{
    var criteria = (pidx != 1 && TempData["SearchCriteria"] != null) ? (Criteria)TempData["SearchCriteria"] : new Criteria()
    {
        //Type = searchType,
        Type = "Name",
        ID = searchValue,
        PageCount = 5
    };