combobox problem

Thanks Dear

Use settings.  In your Solution Explorer > "Project" > Properties > Settings.settings.  There should be one there by default.  Double click on it.
Here, you could set up the variables you want to store.   Choose your var type or click browse if you don't see one there. 

For a combo box, you could store in System.Collections.Specialized.StringCollection.

Say we set up a var called "comboValues" of System.Collections.Specialized.StringCollection type in Settings.settings

in your code (example project name "TestApp"), you could have something like:

using System;
using System.Collections.Specialized;
using TestApp.Properties:

namespace TestApp
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            Settings mySettings = new Settings();

            foreach (string val in mySettings.comboValues)
                myComboBox.Items.Add(val);
        }

        private void SaveComboBoxValues()
        {
            Settings mySettings = new Settings();
            StringCollection myValues = new StringCollection();

            foreach (var cVal in myComboBox.Items)
                myValues.Add(cVal.ToString());

            mySettings.comboValues = myValues;
            mySettings.Save();

        }
}

Dear I am doing that, But I want to it without database is it possible.

Store those values in database before closing an application and next time bind those values again.