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  Nov 30 2014 8:11AM     Prashanth
  13 Comments    19972 Views  
Here Prashanth provided a short tutorial with example, how to fill Combobox Items from Database in Windows Forms Application in C#.
For filling the ComboBox, First have to create a table in Microsoft SQL Server Database as shown below.
Creating a table
When creating a table make Identity Specification as true for column 'ID'.

Set the table name as shown below.
Adding a ComboBox Control to the Windows Form
Firstly you need to add a ComboBox control to the Windows Form from the Visual Studio ToolBox as shown below.

Form Design
You will need to import the following namespace.

using System.Data.SqlClient;

Adding Items to ComboBox from Database in C#
Below is the sample code for Adding Items to ComboBox from Database.

public partial class Form1 : Form
        public Form1()

        private void Form1_Load(object sender, EventArgs e)

        protected void FillCombobox()
            string conString = @"server=YOUR SERVERNAME; database=YOUR DATABASE NAME; uid=***; password=*****;";
            SqlConnection conn = new SqlConnection(conString);
            DataSet ds = new DataSet();
                SqlCommand cmd = new SqlCommand("select ID,EmployeeName from Employee group by ID, EmployeeName", conn);
                SqlDataAdapter da = new SqlDataAdapter();
                da.SelectCommand = cmd;
                comboBox1.DisplayMember = "EmployeeName";
                comboBox1.ValueMember = "ID";
                comboBox1.DataSource = ds.Tables[0];
            catch (Exception ex)
                //Exception Message

I hope this page will helps to fill ComboBox Items in Windows Forms Application in C#. Thanks.

sepehr shakeri
Feb 29 2016 8:00AM
how to 2 or more items in combo box ? for eg mix of three column
Arun Kumar
Feb 29 2016 9:25AM
Hi Sepehr Shakeri, you mean three columns from database.

For Example:

In table, three columns like Country1, Country2, Country3.
In Combobox you have to fill with all the three column content.

Eg: Country1 + Country2 + Country3
Jul 27 2016 3:22AM
Aug 7 2016 12:21PM
how to call a parameterized method to form load
Arun Kumar
Aug 10 2016 10:20PM
You just want to call method with parameter on form load,


In Form Load :

In Method :
protected void FillCombobox(string Message)
Jan 20 2017 11:26AM
how to add items on combobox of one table from another table
Jan 20 2017 11:26AM
how to add items on combobox of one table from another table
Mar 6 2017 10:41PM
Jan 11 2018 10:52PM
if i am select combobox value then to fetch that table values and display in some textboxes so how to write code
Arun Kumar
Mar 10 2018 9:34AM
Hi, For Eg. First you get the Employee Id by Using "Combobox1.SelectedValue" then you will be getting employee Id for the selected employee.

Then pass that employee id to fetch the employee details... Thanks...
Mar 5 2018 8:30AM
Jun 19 2018 10:38AM
how we can pass these combobox value in parameter--In Inserting form .
Jun 29 2018 10:02AM
You can select the value by "Combobox1.SelectedValue", then you can pass this to any methods with the type of integer. Thanks..

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