i retriving unique values from table column values in the dataset

Question

0.00/5 (No votes)

See more:

i have a dataset in that one table is their

table column values are repeated

i want to get the unique values from table column values

not from backend i want to perform this operation using c#

can any one tell me the code ?

before operation -

user id
-------
1
2
33
33
55
67
67

after operation -

result
------
1
2
33
55
67

Posted 8-Sep-11 19:12pm

Srinivas Kumar Pasumarthi

Updated 8-Sep-11 19:22pm

v2

Add a Solution

4 solutions

Solution 1

Use below query

SELECT DISTINCT userid FROM table_name

I am so sorry, this is not correct answer.

Posted 8-Sep-11 19:20pm

nagendrathecoder

Updated 8-Sep-11 19:24pm

v2

Comments

Srinivas Kumar Pasumarthi 9-Sep-11 1:21am

not from backend i want to perform this operation using c#

Solution 2

You can use for example LINQ to achieve a distinct list. For exammple something like the following if the datatype if the field is string:

VB

Dim query = (From item In datatablename.AsEnumerable
             Select item.Field(Of String)("FieldNameInDataTable")).Distinct

Just remember

Posted 8-Sep-11 19:23pm

Wendelius

Solution 4

var sc = MyCollection.GroupBy(m => m.EndDate).Select(g => g.First());

For more details visit on below link.
http://www.code-sample.com/2014/06/distinct-values-from-list-using-linq.html[^]

Posted 23-Jun-14 2:04am

Anil Singh 2010

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Pradeep Shukla · Accepted Answer · 2011-09-08T19:39:00

Solution 3

There is an another simple way of doing it, it would look something like this:

DataSet ds; // The data set that you have
DataTable dt; // The target data table with only distinct data

dt=ds.Tables[0].DefaultView.ToTable(true,[list of columns]);

Hope it helps.

Posted 8-Sep-11 19:39pm

Pradeep Shukla

Updated 8-Sep-11 19:41pm

v3

Comments

[no name] 9-Sep-11 2:31am

Nice one :)