Retrieving Data in GridView from database Using ASP.Net

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.IO;
using System.Data;
using System.Data.OleDb;
using System.Data.SqlClient;
using System.Configuration;

public partial class Admin2_Create_Payroll : System.Web.UI.Page
{
    string ConStr;
    protected void Page_Load(object sender, EventArgs e)
    {
        DisplayEmp();
    }
    public void DisplayEmp()
    {
        try
        {
            ConStr = ConfigurationManager.ConnectionStrings["ConStr"].ConnectionString;
            //SqlDataAdapter Adp = new SqlDataAdapter();
            SqlDataAdapter Adp = new SqlDataAdapter("select * from employees", ConStr);
            DataTable Dt = new DataTable();
            Adp.Fill(Dt);
            if (Dt.Rows.Count > 0)
            {
                GvEmployee.DataSource = Dt;
                GvEmployee.DataBind();
            }

        }
        catch(Exception ex)
        {

        }
        
    }
}

<%@ Page Title="" Language="C#"  AutoEventWireup="true" CodeFile="EmpList.aspx.cs" %>

<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">
    <div class="panel-body col-sm-12">

        <div class="panel panel-default" style="min-height:200px">
            
                
                <asp:GridView ID="GvEmployee" runat="server"></asp:GridView>
               
            
        </div>
    </div>
    
</asp:Content>