Search (Filter) GridView using TextBox inside ASP.Net UpdatePanel in C# and VB.Net

Hi SUJAYS,

Check this example. Now please take its reference and correct your code.

Database

For this example I have used of Northwind database that you can download using the link given below.

Download Northwind Database

HTML

<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
    <ContentTemplate>
        Name:<asp:TextBox ID="txtval1" runat="server" AutoPostBack="true" OnTextChanged="txtval1_Changed"></asp:TextBox>
        <br /><br />
        <asp:GridView runat="server" ID="gvCustomers" AutoGenerateColumns="false">
            <Columns>
                <asp:BoundField DataField="CustomerID" HeaderText="ID" />
                <asp:BoundField DataField="ContactName" HeaderText="Name" />
                <asp:BoundField DataField="Country" HeaderText="Country" />
            </Columns>
        </asp:GridView>
    </ContentTemplate>
</asp:UpdatePanel>

Namespaces

C#

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

VB.Net

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

Code

C#

protected void txtval1_Changed(object sender, EventArgs e)
{
    SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["strConfig"].ConnectionString);
    using (SqlCommand cmd = new SqlCommand("SELECT CustomerID,ContactName,Country FROM Customers WHERE ContactName LIKE +@Name+'%'", con))
    {
        cmd.CommandType = CommandType.Text;
        cmd.Parameters.AddWithValue("@Name", txtval1.Text.Trim());
        using (SqlDataAdapter sda = new SqlDataAdapter(cmd))
        {
            DataTable dt = new DataTable();
            sda.Fill(dt);
            this.gvCustomers.DataSource = dt;
            this.gvCustomers.DataBind();
        }
    }
}

VB.Net

Protected Sub txtval1_Changed(ByVal sender As Object, ByVal e As EventArgs)
    Dim con As SqlConnection = New SqlConnection(ConfigurationManager.ConnectionStrings("strConfig").ConnectionString)
    Using cmd As SqlCommand = New SqlCommand("SELECT CustomerID,ContactName,Country FROM Customers WHERE ContactName LIKE +@Name+'%'", con)
        cmd.CommandType = CommandType.Text
        cmd.Parameters.AddWithValue("@Name", txtval1.Text.Trim())
        Using sda As SqlDataAdapter = New SqlDataAdapter(cmd)
            Dim dt As DataTable = New DataTable()
            sda.Fill(dt)
            Me.gvCustomers.DataSource = dt
            Me.gvCustomers.DataBind()
        End Using
    End Using
End Sub

Screenshot