Need Help to Display Info in webform

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C#

i have the following code in web.config file

<connectionstrings>
   <add name="ConnectionStringdb" connectionstring="Data Source=local; Initial Catalog=TeltonikaCRM; Persist Security Info=True; User ID=sa;password=Ali998877;">
     providerName="System.Data.SqlClient" />
   <add name="TeltonikaCRMConnectionString" connectionstring="Data Source=(LocalDB)\v11.0;AttachDbFilename=C:\Users\Administrator\Documents\TeltonikaCRM.mdf;Integrated Security=True;Connect Timeout=30">
     providerName="System.Data.SqlClient" />
 </add></add></connectionstrings>

and the following in default.aspx.cs

using System.Data.OleDb;
using System.ComponentModel;
using System.Drawing;
using System.Text;


namespace CRMTracking.Pages
{
    public partial class Default2 : System.Web.UI.Page
    {
        CRMTracking.Classes.DBConnect DBC;
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {

                //Establishing the MySQL Connection
                DBC = new Classes.DBConnect(this.Page);
                DBC.SetSqlConnection(ConfigurationManager.ConnectionStrings["ConnectionStringdb"].ToString());
                DataTable dt = new DataTable();
                string query;
                SqlCommand SqlCommand;
                SqlDataReader reader;
                SqlDataAdapter adapter = new SqlDataAdapter();
                //Open the connection to db
                

                //Generating the query to fetch the contact details
                query = "SELECT * FROM UserInfo";

                SqlCommand = new SqlCommand(query, DBC.GetSqlConnection());

                //execute the query
                
                reader = SqlCommand.ExecuteReader();
                
                txtFName.Text = reader["UFName"].ToString();
                //Assign the results 
                GridView1.DataSource = reader;

                //Bind the data
                GridView1.DataBind();
            }     
        }
}
}

and a connection Class coding is

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

namespace CRMTracking.Classes
{
    
    public class DBConnect
    {
        Page Pg=new Page();
        SqlConnection SqlConn;

        public DBConnect(Page CurerntPg) {Pg = CurerntPg;}

        public void MsgBox(String Message)
        { Pg.ClientScript.RegisterStartupScript(Pg.GetType(), "MessageBox", "<script language='javascript'>alert('" + Message + "');</script>"); }

        public SqlConnection GetSqlConnection() {return SqlConn;}

        public void SetSqlConnection(String CString) 
        {
            try
            {
                SqlConn = new SqlConnection(CString);
                SqlConn.Open();
            }
            catch (Exception ce)
            { MsgBox("Error Opening Connection to Sql Server....." + ce); return; }      
            //
        }
}
}

but the result is just a blank page please help me