Check Duplicate Value in Array vb.net

Question

0.00/5 (No votes)

See more:

Hi,

how can i check if there's a duplicate value in array?

VB

Dim array(9) as String

array(0) = Textbox1.Text
array(1) = Textbox2.Text
array(2) = Textbox3.Text
array(3) = Textbox4.Text
array(4) = Textbox5.Text
array(5) = Textbox6.Text
array(6) = Textbox7.Text
array(7) = Textbox8.Text
array(8) = Textbox9.Text
array(9) = Textbox10.Text

if there's a duplicate value or text then the backcolor of the textbox turns to red.

any help will be highly appreciated.

Posted 6-Dec-12 7:20am

TinTin19

Updated 6-Dec-12 8:55am

ridoy

v2

Add a Solution

3 solutions

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)

BC @ CV · Answer 1 · 2012-12-06T10:21:00

Try this:

C#

C#

IEnumerable<Control> ctls = this.Controls.Cast<Control>();
var txtBoxQuery = from c in ctls
                  where c is TextBox && ctls.Count(x => x.Text == c.Text) > 1
                  select c;
foreach (Control c in txtBoxQuery)
        c.BackColor = Color.Red;

VB

Dim ctls As IEnumerable(Of Control) = Me.Controls.Cast(Of Control)()
Dim txtBoxQuery = From c In ctls Where TypeOf c Is TextBox And ctls.Count(Function(x) x.Text = c.Text) > 1 Select c
For Each c As Control In txtBoxQuery
   c.BackColor = Color.Red
Next

joshrduncan2012 · Answer 2 · 2012-12-06T07:22:00

Solution 1

http://lmgtfy.com/?q=vb.net+check+for+duplicate+value+in+array[^]

Posted 6-Dec-12 7:22am

joshrduncan2012

Comments

Adam R Harris 6-Dec-12 13:24pm

Great answer! I love that site.

joshrduncan2012 6-Dec-12 13:26pm

Can you rate my answer, please?

Adam R Harris 6-Dec-12 13:33pm

Way ahead of you man, that's where the 5 stars came from.

joshrduncan2012 6-Dec-12 13:35pm

Thanks Adam! Sometimes I can't tell when something has been voted on or not.

ridoy · Answer 3 · 2012-12-06T09:06:00

Some links for checking duplicate values..then apply your logic to change color of textbox..
http://www.vbforums.com/showthread.php?157498-Removing-duplicates-from-an-array[^]
http://social.msdn.microsoft.com/Forums/en-US/vbgeneral/thread/0754a61c-3643-49a6-9f72-34d5d76cedf0[^]
http://www.visualbasicscript.com/removing-duplicate-array-values-m27947.aspx[^]

Check Duplicate Value in Array vb.net

3 solutions

Solution 3

Solution 1

Solution 2

Add your solution here

Preview 0