Filling ComboxBox with Data in VB.Net and SQL Server 2019

Submitted by janobe on Thursday, November 14, 2019 - 22:41.

In this tutorial, I will teach you how to Fill a ComboBox with Data in VB.Net and SQL Server 2019. This method has the ability to retrieve the data in the sql server database and display it into the combobox. This is simple yet powerful method that you can do it in no time. Follow the step by step guide to know how it works. I used Microsoft Visual Studio 2015 and SQL Server 2019 to develop this program. Let’s Begin:

Creating Database

1. Install the MSSMS 2019 on your machine. 2. Open the MSSMS 2019 . After that, right click the database, then select “New Database” and name it “dbperson” fig 1

3. Do the following query to create a table in the database that you have created

 
USE [dbperson]
GO
 
/****** Object:  Table [dbo].[tblperson]    Script Date: 11/10/2019 11:15:11 AM ******/
SET ANSI_NULLS ON
GO
 
SET QUOTED_IDENTIFIER ON
GO
 
CREATE TABLE [dbo].[tblperson](
	[PersonID] [INT] IDENTITY(1,1) NOT NULL,
	[Fname] [nvarchar](50) NULL,
	[Lname] [nvarchar](50) NULL
) ON [PRIMARY]
GO

Creating Application

Step 1

Open Microsoft Visual Studio 2015 and create a new windows form application for visual basic. ps1

Step 2

Add a ComboBox inside the Form. Then do the Form just like shown below. fig 2

Step 3

Press F7 to open the code editor. In the code editor, add a namespace to access SQL Server libraries.

 
Imports System.Data.SqlClient

Step 4

Create a connection between Visual Basic 2015 and SQL Server database. After that, declare and initialize all the classes and variables that are needed.

 
    Dim con As SqlConnection = New SqlConnection("Data Source=.\SQLEXPRESS;Database=dbperson;trusted_connection=true;")
    Dim cmd As SqlCommand
    Dim da As SqlDataAdapter
    Dim dt As DataTable
    Dim sql As String

Step 5

Create a method for filling data in the combobox in the database.

 
    Private Sub fillCombo(sql As String, cbo As ComboBox)
        Try
            con.Open()
 
            cmd = New SqlCommand
            da = New SqlDataAdapter
            dt = New DataTable
 
            With cmd
                .Connection = con
                .CommandText = sql
            End With
 
            With da
                .SelectCommand = cmd
                .Fill(dt)
            End With
 
            cbo.DataSource = dt
            cbo.DisplayMember = dt.Columns(1).ColumnName
            cbo.ValueMember = dt.Columns(0).ColumnName
 
        Catch ex As Exception
            MsgBox(ex.Message)
        Finally
            con.Close()
            da.Dispose()
        End Try
    End Sub

Step 6

Write the following codes to fill data in the combobox in the first load of the form.

 
    Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
        sql = "SELECT * FROM tblperson"
        fillCombo(sql, ComboBox1)
    End Sub

The complete source code is included. You can download it and run it on your computer. For any questions about this article. You can contact me @ Email – [email protected] Mobile No. – 09305235027 – TNT Or feel free to comment bel

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