ASP.NET WEB API Update service

Question

Hi 

 //sample of my controller method

public IEnumerable<LookUpModel> Updatedetails(string Lookuptype, string AccountName, string MetaData)

{

}

 

any one please suggest i need to update the values from the KnockoutGrid to database using Web ap i service in asp.net (Without entity framework) 

thanks in advance