Combobox changing its index by itself

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April 1st, 2012, 10:31 AM

conta

Registered User

Join Date: Jul 2010

Posts: 13

Time spent in forums: 3 h 56 m 31 sec
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Combobox changing its index by itself

hi,

i have ComboBox in which I have names of employees.

I created ComboBox_SelectedIndexChanged so when I pick something from ComboBox, I take employee and do something [write somethin into TextBox]

Works fine, but I have problem when I have employees with same name: when I click to TextBox or some button, SelectedIndex is changed to index of employee with same name, but smaller index [i mean the one that is "upper" in ComboBox items]!

Any idea why? Can I make this behaviour stop?

For Combobox I have this class, because I need to show and receive different stuff:

Code:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Diploma
{
    //own class for combobox to show and use different item
    class ComboBoxItem
    {
        private string name; // sth to show, eg employee name and surname
        private string value;  //eg: employee_id- make sure unique 

        public string Value
        {
            get { return this.value; }
            set { this.value = value; }
        }
        public string Name
        {
            get { return name; }
            set { name = value; }
        }

        public ComboBoxItem(string nName, string nValue)
        {
            this.name = nName;
            this.value = nValue;
        }

        public override string ToString()
        {
            return this.name;
        }
    }
}

I have visual studio 2010, project is in C#

April 1st, 2012, 04:27 PM

Ronster

Contributing User

Join Date: Feb 2007

Location: Charlotte

Posts: 412

Time spent in forums: 5 Days 2 h 6 m 13 sec
Reputation Power: 143

A combobox has two properties on the page... the *value* and the *text*. The text property is what is shown on the page to the user. The value property is how you interact with the combo box. I'm thinking the problem you're having is that maybe the value properties have to be unique?

While you could have two "John Smith" text properties, but not two "John Smith" value properties. You would get around this possibly by having an employee ID as the value property.

As a test... while creating the combobox, use a counter and increment and make that the value part, when you select, see if that gives the appropriate one.

April 2nd, 2012, 07:53 AM

conta

Registered User

Join Date: Jul 2010

Posts: 13

Time spent in forums: 3 h 56 m 31 sec
Reputation Power: 0

thanks for ideas!

anyway I think I found out whats the reason of this behaviour:

i have AutoCompleteMode property set to SuggestAttach.

when set to None, behaviour is normal, nothing is changing. Any other work as I said earlier. Maybe someone had similar problem before?

I add stuff to ComboBox like this:

Code:

foreach (DataRow r in dt2.Rows)
                {
                    delEmpChooseComboBox.Items.Add(new ComboBoxItem(r["name"] + " " + r["surname"], r["employee_id"].ToString()));
                }

thing is that I use this to pick what employee I wanna delete - but, when I click on delete button, the employee is changed to employee with same name, but higher at the ComboBox, so I am not able to delete the one I wanna!

Thanks for ideas!

Combobox changing its index by itself

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