How to loop for id from data base using LINQ?

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I try it by using datatable like that

C#

for (int i = 0; i < dtp.Rows.Count; i++)
            {
                if (dtp.Rows[i]["UserId"].ToString() == formid.ToString())
              {
                   
              }
           }

Now I need it but by using LINQ How can I loop linq query

my linq query like that

SQL

int ID = (from s in con.TUsers
                                    where s.UserId.Equals(comboBox1.SelectedValue)
                                    select s.UserId).SingleOrDefault();

help me please
thanx in advance.

Posted 25-Jun-12 18:10pm

Sarah Mohammed77

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Comments

Aman4.net 26-Jun-12 0:18am

Please do explain your requirements and problems/errors in question. Still here is a clue based on your question:
In string comparison with C#, we need to check that values have same character casing and no extra spaces etc.

2 solutions

Solution 2

C#

  var UserID = (from row in dtp.AsEnumerable()
 where row.Field<int>("UserID")==comboBox1.SelectedValue
select row.Field<int>("UserID")).FirstOrDefault();
</int></int>

Any error about AsEnumerable, just add this assembly:
C:\Windows\Microsoft.NET\Framework\v4.0.30319\System.Data.DataSetExtensions.dll

Posted 25-Jun-12 19:09pm

Аslam Iqbal

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vyas_pratik20 · Accepted Answer · 2012-06-25T18:21:00

Solution 1

hi,

I LINQ no need to use loop it goes through all the records available in collection and check for the given where condition and returns the matching data.

Posted 25-Jun-12 18:21pm

vyas_pratik20