Set ASP.Net AjaxToolkit ComboBox Value using jQuery

Hi pramshi,

Refer below sample.

Database

I have made use of the following table Customers with the schema as follows.

I have already inserted few records in the table.

You can download the database table SQL by clicking the download link below.

Download SQL file

HTML

<asp:ScriptManager runat="server"></asp:ScriptManager>
<ajaxToolkit:ComboBox ID="cbCustomers" runat="server" AutoCompleteMode="SuggestAppend"></ajaxToolkit:ComboBox>
<asp:Button ID="btnSet" runat="server" Text="Set Value" />
<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
<script type="text/javascript">
    $(function () {
        $('[id*=btnSet]').on('click', function () {
            $find("<%= cbCustomers.ClientID %>").get_textBoxControl().value = "Mudassar Khan";
            return false;
        });
    });
</script>

Namespaces

C#

using System.Data;
using System.Configuration;
using System.Data.SqlClient;

VB.Net

Imports System.Data
Imports System.Configuration
Imports System.Data.SqlClient

Code

C#

protected void Page_Load(object sender, EventArgs e)
{
    if (!this.IsPostBack)
    {
        string constr = ConfigurationManager.ConnectionStrings["constr"].ConnectionString;
        using (SqlConnection con = new SqlConnection(constr))
        {
            using (SqlCommand cmd = new SqlCommand("SELECT CustomerId, Name FROM Customers"))
            {
                cmd.CommandType = CommandType.Text;
                cmd.Connection = con;
                con.Open();
                cbCustomers.DataSource = cmd.ExecuteReader();
                cbCustomers.DataTextField = "Name";
                cbCustomers.DataValueField = "CustomerId";
                cbCustomers.DataBind();
                con.Close();
            }
        }
    }
}

VB.Net

Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
    If Not Me.IsPostBack Then
        Dim constr As String = ConfigurationManager.ConnectionStrings("constr").ConnectionString
        Using con As SqlConnection = New SqlConnection(constr)
            Using cmd As SqlCommand = New SqlCommand("SELECT CustomerId, Name FROM Customers")
                cmd.CommandType = CommandType.Text
                cmd.Connection = con
                con.Open()
                cbCustomers.DataSource = cmd.ExecuteReader()
                cbCustomers.DataTextField = "Name"
                cbCustomers.DataValueField = "CustomerId"
                cbCustomers.DataBind()
                con.Close()
            End Using
        End Using
    End If
End Sub

Screenshot