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Sunday 15 February 2015

Databinding in ComboBox in C#

In this Article, we will see How to bind data in ComboxBox from database in C# Windows Form Application. In previous post, we saw How to:

Let's Begin:
1. Go to New -> Project -> Select Windows Form Application.
2. Create a Database (named as Sample). Add a Table tbl_Country. The following is the table schema for creating tbl_Country.
3. Drop Label and ComboBox control from the toolbox.
Form1.cs Code:

using System;
using System.Data;
using System.Windows.Forms;
using System.Data.SqlClient;

namespace ComboBoxDataBind
    public partial class Form1 : Form
        public Form1()
        //Form Load
        private void Form1_Load(object sender, EventArgs e)
        //fillComboBox method for filling the ComboBox with Data
        private void fillComboBox()
                using (SqlConnection con = new SqlConnection("Data Source=.;Initial Catalog=Sample;Integrated Security=true;"))
                    SqlDataAdapter adapt = new SqlDataAdapter("Select * from tbl_Country", con);
                    DataTable dt = new DataTable();
                    //Set Displaymember as Country
                    cmb_Country.DisplayMember = "Country";
                    //Set ValueMember as ID
                    cmb_Country.ValueMember = "ID";
                    cmb_Country.DataSource = dt;
            catch(Exception ex)
        //cmb_Country_SelectedIndexChanged Event
        private void cmb_Country_SelectedIndexChanged(object sender, EventArgs e)
            lbl_DisplayValue.Text = cmb_Country.SelectedValue.ToString();
In the above code, I have created fillComboBox() method for filling the ComboBox with data and also created cmb_Country_SelectedIndexChanged event which fires when the SelectedIndex property changed.
Final Preview:
Hope you like it. Thanks.
[Download Source code via Google Drive]


  1. I am strugglling with "Data Source=.;Initial Catalog=Sample;Integrated Security=true;"))
    as I do not know how to write it in my application.
    Can you tell me what it is and also what I need to write for my application.


    1. "Data Source=.;Initial Catalog=Sample;Integrated Security=true;" is a connection string that includes the source database name, and other parameters required to establish the initial connection with database. Please create a Database (named as Sample) and add a Table tbl_Country and follow each step as shown in this Post.

  2. good Man, thanks,can i have your direct email address plz?

  3. How can we get combo box selected data and assign to class object. Plz plz answer anyone

  4. Replies
    1. It's working fine. Always try to share the error which you are getting so that we can help you on that issue.


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