[Solved] Inserting an item in the combobox after binding data

Question

1.00/5 (1 vote)

See more:

Hi all,

I have a combobox binded with items.
I want to insert an item to be displayed first to tell the user to choose an item

var type = from m_types in DB.Types
           select m_types;

combobox.ValueMember = "Id";
combobox.DisplayMember = "Name";
combobox.DataSource = type;

I tried this but it return an error that a binded combobox can't be modified

combobox.Items.Insert(0, "Please choose an item");

Please is there a way to insert this item?

Thanks in advance.

Best regards,
Michael Waguih
:)

Posted 13-Aug-13 9:10am

Michael Waguih

Updated 20-Aug-13 22:18pm

v3

Add a Solution

Comments

Sergey Alexandrovich Kryukov 13-Aug-13 18:08pm

ComboBox? Which one? Exact full type name, please.
—SA

4 solutions

Solution 3

Check these solutions,possibly your problem would be solved.
insert item in combobox after binding it from a Dataset in c#[^]
Add Custom Item after Databinding[^]
WinForm ComboBox add text “Select” after data binding[^]

Posted 13-Aug-13 10:21am

ridoy

Solution 1

You have to add the item to the datasource you bound the Combo to. Once you bind data to the Combo, you cannot use the Combo's own Items collection.

Posted 13-Aug-13 9:14am

Dave Kreskowiak

Comments

Michael Waguih 13-Aug-13 15:26pm

How to add it with such code please ?

Solution 2

C#

 combobox.SelectedValuePath= "Id";
 combobox.DisplayMemberPath= "Name";
 combobox.ItemsSource= type;
combobox.Text="Please choose an item";

Posted 13-Aug-13 9:17am

abbaspirmoradi

Comments

Michael Waguih 13-Aug-13 15:24pm

I tried it and it didn't work

abbaspirmoradi 13-Aug-13 15:35pm

U should create a class for type such this:
public class Type
{
public string Name { get; set; }

public string Id{ get; set; }

public Type(string name, string id)
{
Name= name;
Id= id;
}
}

Michael Waguih 13-Aug-13 15:37pm

This class is already created I need to add an item to the selected data from this class

abbaspirmoradi 13-Aug-13 15:47pm

Ok.You must have list of types.
List<type> Types=from m_types in DB.Types
select m_types;
Is this right?

Michael Waguih 13-Aug-13 15:49pm

right and it's written in the question

abbaspirmoradi 13-Aug-13 15:51pm

Are u check list of Type it have Any data in run time?

Michael Waguih 13-Aug-13 15:54pm

Sorry I don't understand ?

abbaspirmoradi 13-Aug-13 15:58pm

your list of type is'nt null?

Michael Waguih 13-Aug-13 16:00pm

No it is not null it have data and it is filled in the combobox

abbaspirmoradi 13-Aug-13 16:06pm

so what is wrong? are you still try to "Please choose an item" as your combobox text?

abbaspirmoradi 13-Aug-13 16:20pm

see Michael it should work.I use this way in my App And it worked for me.

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)

Michael Waguih · Accepted Answer · 2013-08-20T22:17:00

var type = from m_types in DB.Types
           select m_types;

DataTable dt_Types = new DataTable();
dt_Types.Columns.Add("t_ID", typeof(int));
dt_Types.Columns.Add("t_Name", typeof(string));
foreach (var t in type)
{
    dt_Types.Rows.Add(t.Id, t.Name);
}
DataRow dr = dt_Types.NewRow();
dr[0] = -1;
dr[1] = "Please choose an item";
dt_Types.Rows.InsertAt(dr, 0);
if (dt_Types.Rows.Count > 0)
{
    cbx_Types.DataSource = dt_Types;
    cbx_Types.DisplayMember = "t_Name";
    cbx_Types.ValueMember = "t_ID";
}

[Solved] Inserting an item in the combobox after binding data

4 solutions

Solution 3

Solution 1

Solution 4

Solution 2

Add your solution here

Preview 0

Existing Members

...or Join us