How to select the values from the Result of linq

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Hi,

I am having a gridview in that I am having select check box. While selecting the rows and clicking the Update button I am selecting the rows which are selected in the gridview through linq. In this selected linq query I want to get the two column values(SlNO,RefNO) as a result set. How to get this one through linq. Here is my linq code for selecting the selected value from the grid.

SQL

var result = from GridViewRow msgRow in grdPrice.Rows
                    where ((CheckBox)msgRow.FindControl("chkSelect")).Checked
                    select grdPrice.Rows[msgRow.RowIndex];

Thanks

Posted 31-Jan-14 19:18pm

Member 7946563

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Sampath Lokuge · Answer 1 · 2014-01-31T19:40:00

Solution 1

You can use an Anonymous Types properties to do your task.Please check the below sample.

C#

var result = (from GridViewRow msgRow in grdPrice.Rows
                    where ((CheckBox)msgRow.FindControl("chkSelect")).Checked
                    select new {
                                 SlNO=YourSInoValue,
                                 RefNO=YourRefNOValue,
                               }).ToList();

Posted 31-Jan-14 19:40pm

Sampath Lokuge

Updated 31-Jan-14 20:27pm

v5

Comments

Member 7946563 1-Feb-14 1:56am

How to save this list as arraylist.

Sampath Lokuge 1-Feb-14 1:59am

You can save it by using 'foreach loop'.Just loop through the list and save it in your tables.
You can access your list values by using result.SlNO and result.RefNO etc...

Member 7946563 1-Feb-14 2:01am

Without for loop any other way.

Sampath Lokuge 1-Feb-14 2:02am

Nope,You cannot.B'cos this is the list.If it's a single value then you can.What is your problem ?

Member 7946563 1-Feb-14 2:07am

I want to select only the slno from that linq query like 1,2,3,4,5 and I want to send it to database to update the values.

Sampath Lokuge 1-Feb-14 2:12am

Yep,Then use FirstOrDefault() and save that value into table without a loop.I have updated the above solution also.Please check that.

Member 7946563 1-Feb-14 2:24am

Its returning only one row value but I have selected 3 rows in the grid.

Sampath Lokuge 1-Feb-14 2:26am

Then you have to use list.No other option.

Member 7946563 1-Feb-14 3:46am

Can you please help me how to copy this result to datatable. The copytoDatatable is not coming for this result

var result = (from GridViewRow msgRow in grdPrice.Rows
let ReferenceNO = ((HiddenField)msgRow.FindControl("hfReferenceNo")).Value
where ((CheckBox)msgRow.FindControl("chkSelect")).Checked
select new { ReferenceNO }).ToList();

Sampath Lokuge 1-Feb-14 3:50am

Why can't you use 'foreach' loop to fill the records into your table ?

Member 7946563 1-Feb-14 3:51am

There are nearly 10,000 rows If I use foreach it will slow down the form.

Sampath Lokuge 1-Feb-14 4:01am

Is this Windows or web app ?

Member 7946563 1-Feb-14 4:04am

Web App

Sampath Lokuge 1-Feb-14 4:09am

Firstly try with the foreach. If it'll very slow then you can do that in 2 ways.First way is use jQuery Ajax method.Other one is 'Asynchronous Programming' with your events.Check this : http://msdn.microsoft.com/en-us/library/hh191443.aspx