[Solved] jQuery DataTables not working with GridView ShowSelectButton is True in ASP.Net

Hi garzam_44,

Refer below sample and modify your code.

HTML

div style="width: 500px">
    <asp:GridView ID="gvCustomers" runat="server" CssClass="display compact" AutoGenerateColumns="false"
        ClientIDMode="Static">
        <Columns>
            <asp:CommandField ShowSelectButton="True" ButtonType="Button" HeaderText="Seleccionar">
                <ControlStyle CssClass="btn btn-primary" />
            </asp:CommandField>
            <asp:BoundField DataField="CustomerID" HeaderText="Customer Id" />
            <asp:BoundField DataField="ContactName" HeaderText="Name" />
            <asp:BoundField DataField="City" HeaderText="City" />
            <asp:BoundField DataField="Country" HeaderText="Country" />
        </Columns>
    </asp:GridView>
</div>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.2/css/bootstrap.min.css" />
<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
<script type="text/javascript" src="https://cdn.datatables.net/1.10.20/js/jquery.dataTables.min.js"></script>
<link type="text/css" rel="stylesheet" href="https://cdn.datatables.net/1.10.20/css/jquery.dataTables.css" />
<script type="text/javascript">
    $(function () {
        $.ajax({
            type: "POST",
            url: "Default.aspx/GetCustomers",
            data: '{}',
            contentType: "application/json; charset=utf-8",
            dataType: "json",
            success: function (response) {
                $("[id*=gvCustomers]").DataTable({
                    bLengthChange: true,
                    lengthMenu: [[5, 10, -1], [5, 10, "All"]],
                    bFilter: true,
                    bSort: true,
                    bPaginate: true,
                    data: response.d,
                    columns: [
                                { "defaultContent": "<button type:'button' id='btnSelect' class='btn btn-primary'>Seleccionar</button>" },
                                { 'data': 'CustomerID' },
                                { 'data': 'ContactName' },
                                { 'data': 'City' },
                                { 'data': 'Country'}]
                });
            },
            failure: function (response) {
                alert(response.d);
            },
            error: function (response) {
                alert(response.d);
            }
        });

        $('#gvCustomers tbody').on('click', '[id*=btnSelect]', function () {
            var data = $(this).closest('tr').find('td');
            var customerId = data.eq(1).html();
            var name = data.eq(2).html();
            var city = data.eq(3).html();
            var country = data.eq(4).html();
            alert("Id : " + customerId + "\nName : " + name + "\nCity : " + city + "\nCountry : " + country);
            return false;
        });
    });        
</script>

Namespaces

C#

using System.Configuration;
using System.Data;
using System.Data.SqlClient;
using System.Web.Services;

VB.Net

Imports System.Configuration
Imports System.Data
Imports System.Data.SqlClient
Imports System.Web.Services

Code

C#

protected void Page_Load(object sender, EventArgs e)
{
    if (!this.IsPostBack)
    {
        DataTable dummy = new DataTable();
        dummy.Columns.Add("CustomerID");
        dummy.Columns.Add("ContactName");
        dummy.Columns.Add("City");
        dummy.Columns.Add("Country");
        dummy.Rows.Add();
        gvCustomers.DataSource = dummy;
        gvCustomers.DataBind();

        //Required for jQuery DataTables to work.
        gvCustomers.UseAccessibleHeader = true;
        gvCustomers.HeaderRow.TableSection = TableRowSection.TableHeader;
    }
}

[WebMethod]
public static List<Customer> GetCustomers()
{
    List<Customer> customers = new List<Customer>();
    string constr = ConfigurationManager.ConnectionStrings["constr"].ConnectionString;
    using (SqlConnection con = new SqlConnection(constr))
    {
        using (SqlCommand cmd = new SqlCommand("SELECT CustomerID, ContactName, City, Country FROM Customers", con))
        {
            con.Open();
            using (SqlDataReader sdr = cmd.ExecuteReader())
            {
                while (sdr.Read())
                {
                    customers.Add(new Customer
                    {
                        CustomerID = sdr["CustomerID"].ToString(),
                        ContactName = sdr["ContactName"].ToString(),
                        City = sdr["City"].ToString(),
                        Country = sdr["Country"].ToString()
                    });
                }
            }
            con.Close();
        }
    }

    return customers;
}

public class Customer
{
    public string CustomerID { get; set; }
    public string ContactName { get; set; }
    public string City { get; set; }
    public string Country { get; set; }
}

VB.Net

Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
    If Not Me.IsPostBack Then
        Dim dummy As DataTable = New DataTable()
        dummy.Columns.Add("CustomerID")
        dummy.Columns.Add("ContactName")
        dummy.Columns.Add("City")
        dummy.Columns.Add("Country")
        dummy.Rows.Add()
        gvCustomers.DataSource = dummy
        gvCustomers.DataBind()
        gvCustomers.UseAccessibleHeader = True
        gvCustomers.HeaderRow.TableSection = TableRowSection.TableHeader
    End If
End Sub

<WebMethod()>
Public Shared Function GetCustomers() As List(Of Customer)
    Dim customers As List(Of Customer) = New List(Of Customer)()
    Dim constr As String = ConfigurationManager.ConnectionStrings("constr").ConnectionString
    Using con As SqlConnection = New SqlConnection(constr)
        Using cmd As SqlCommand = New SqlCommand("SELECT CustomerID, ContactName, City, Country FROM Customers", con)
            con.Open()
            Using sdr As SqlDataReader = cmd.ExecuteReader()
                While sdr.Read()
                    customers.Add(New Customer With {
                        .CustomerID = sdr("CustomerID").ToString(),
                        .ContactName = sdr("ContactName").ToString(),
                        .City = sdr("City").ToString(),
                        .Country = sdr("Country").ToString()
                    })
                End While
            End Using
            con.Close()
        End Using
    End Using

    Return customers
End Function

Public Class Customer
    Public Property CustomerID As String
    Public Property ContactName As String
    Public Property City As String
    Public Property Country As String
End Class