[c#] Select method in List<t> Collection

I have an asp.net application, and now I am using datasets for data manipulation. I recently started to convert this dataset to a List collection. But, in some places it doesn't work. One is that in my old version I am using datarow[] drow = dataset.datatable.select(searchcriteria). But in the List collection there is no method available for finding particular values. Is there any way for me to select some values according with my search criteria? I want to know if this is possible. Please help me.

Generic List<T> have the Where<T>(Func<T, Boolean>) extension method that can be used to filter data.

In your case with a row array:

var rows = rowsArray.Where(row => row["LastName"].ToString().StartsWith("a"));

If you are using DataRowCollection, you need to cast it first.

var rows = dataTableRows.Cast<DataRow>().Where(row => row["LastName"].ToString().StartsWith("a"));

Try this:

using System.Data.Linq;
var result = from i in list
             where i.age > 45
             select i;

Using lambda expression please use this Statement:

var result = list.where(i => i.age > 45);

you can also try

var query = from p in list
            where p.Age > 18
            select p;

I have used a script but to make a join, maybe I can help you

string Email = String.Join(", ", Emails.Where(i => i.Email != "").Select(i => i.Email).Distinct());