linq-to-dataset

Just wanted to check if there is way to do distinct by multiple columns. Thanks in advance!!! BTW, I found a great LINQ extension here but need some guidance to use it for multiple columns Well, you can do the projection first: var qry = db.Customers.Select(cust => new {cust.ID, cust.Name, cust.Region}) .Distinct(); Or in query syntax: var qry = (from cust in db.Customers select new {cust.ID, cust.Name, cust.Region}).Distinct(); That do? Pradeep Instead of Distinct you can use Groupby and then selecting the Top Most record of each group How to LINQ Distinct by Multiple Fields without anonymous

I am trying to get distinct rows based on multiple columns (attribute1_name, attribute2_name) and get datarows from datatable using Linq-to-Dataset. I want results like this attribute1_name attribute2_name -------------- --------------- Age State Age weekend_percent Age statebreaklaw Age Annual Sales Age Assortment How to do thin Linq-to-dataset? If it's not a typed dataset, then you probably want to do something like this, using the Linq-to-DataSet extension methods: var distinctValues = dsValues.AsEnumerable() .Select(row => new { attribute1_name = row.Field<string>("attribute1_name"),

i am using the below code IEnumerable<DataRow> query = from c in at.appointmentcalendars.AsEnumerable() select c; DataTable dt = query.CopyToDataTable(); But i am getting the below error Cannot implicitly convert type 'System.Collections.Generic.IEnumerable<appointmentcalendar>' to 'System.Collections.Generic.IEnumerable<System.Data.DataRow>' . An explicit conversion exists (are you missing a cast?) terrybozzio Since the query returns an IEnumerable of Type DataRow, you have to specify what to insert into the datatable, in this case DataRow. DataTable dt = query.CopyToDataTable<DataRow>(); If

Using linq to query a datatable returns the following error: CS0117: 'DataSet1.map DataTable' does not contain a definition for 'AsEnumerable' Project includes reference for System.Data.Datasetextensions. Here's the code. using System; using System.Collections; using System.ComponentModel; using System.Configuration; using System.Reflection; using System.Data; using System.Linq; using System.Data.Linq; using System.Data.Common; using System.Data.DataSetExtensions; using System.Linq.Expressions; using System.Web; using System.Web.Security; using System.Web.UI; using System.Web.UI.HtmlControls;