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Linq is language integrated query.
Below is simple examle of Linq syntex

We will query an array of string.

//Create an array of Strings string[] arr = "A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,V,W,X,Y,Z".Split(",".ToCharArray()); //Populate listbox with array of strings ListBox1.DataSource = arr; //Bind array of strings to Listbox ListBox1.DataBind(); //Using linq syntex we will query an array of strings and find the word "S"  and "M" var query = from alphabet in arr                     where (alphabet == "S" || alphabet == "M")                     select alphabet  ;                     // A query body must end with a select clause or a group clause  foreach(var alpha in query) { Response.Write(alpha+"<Br/>");   //Write the word found }

How simple it is ! ∞