How do I use a check of already existing value value in a list in asp.net?

Question

1.00/5 (2 votes)

See more:

I have used two textboxes and stored there value in a list.
ListBox1.Items.Add(TextBox1.Text + "" + TextBox2.Text)

Now i want to add a check of already existing so that same value does n't go in the list.Any body please help its urgent ..!!!!!!!!!!!!

Posted 13-Nov-15 19:49pm

Member 12119549

Add a Solution

Comments

Maciej Los 14-Nov-15 2:03am

What is stopping you?

Member 12119549 14-Nov-15 2:17am

For Each item As var In ListBox1.Items
If item <> TextBox1.Text + "" + TextBox2.Text Then
ListBox1.Items.Add(TextBox1.Text + "" + TextBox2.Text)
End If
Next

i have used it in vb.. its giving be error on var..plz help?

Afzaal Ahmad Zeeshan 14-Nov-15 2:27am

The var is in C#, in VB.NET you need to write the type. Perhaps, it would be ListBoxItem.

Member 12119549 14-Nov-15 2:31am

completly stuck :( didnt get you sir

Afzaal Ahmad Zeeshan 14-Nov-15 2:34am

Have a look at https://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.listcontrol.items(v=vs.110).aspx.

Member 12119549 14-Nov-15 2:48am

Dim v1 As ListItem
v1 = TextBox1.Text + "" + TextBox2.Text

If ListBox1.Items.Contains(v1) = True Then

Response.Write("Item exists")

End If

GOT up to this point..why can't i save a value in v1 and access it..is there any way?

Afzaal Ahmad Zeeshan 14-Nov-15 2:57am

Debug the application and see what is the value of textboxes.

Member 12119549 14-Nov-15 3:10am

not allowing me ..i am using a listitem and assigning a textbox.. :( but what else i can do ??

Member 12119549 14-Nov-15 3:55am

?

Member 12119549 14-Nov-15 6:43am

any help?

1 solution

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)

Krunal Rohit · Answer 1 · 2015-11-13T20:01:00

Solution 1

C#

foreach(var item in ListBox1.Items)
{
    if(item != TextBox1.Text + "" + TextBox2.Text){
        ListBox1.Items.Add(TextBox1.Text + "" + TextBox2.Text);
    }
}

-KR

Posted 13-Nov-15 20:01pm

Krunal Rohit

Updated 13-Nov-15 20:05pm

v2

Comments

Member 12119549 14-Nov-15 2:08am

Thanks for your responce,can you please tell what is var in it..getting error while conveeting it :(

Member 12119549 14-Nov-15 2:22am

@Rohit???

Krunal Rohit 14-Nov-15 2:46am

For Each item As String In ListBox1.Items
If item <> TextBox1.Text + "" + TextBox2.Text Then
ListBox1.Items.Add(TextBox1.Text + "" + TextBox2.Text)
End If
Next

Afzaal Ahmad Zeeshan 14-Nov-15 2:26am

He is using VB.NET, not C#.

Intellect of user forces him to use copy/paste, which brings him down to more problems.

Member 12119549 14-Nov-15 6:24am

Any help?