รบกวนพี่ๆ ช่วยแก้ปัญหาให้ผมหน่อยครับ ว่ามัน Error ตรงไหนครับ 1

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

public partial class admin_Profile : System.Web.UI.Page
{
    
    protected void Page_Load(object sender, EventArgs e)
    {
        if (Convert.ToString(Session["Login"]) == "")
        {
            Response.Redirect("../Login.aspx");
            Response.End();
        }
        ViewDataInf();
    }
    protected void ViewDataInf()
    {
        SqlConnection objConn = null;
        string strConnString = null;
        StringBuilder strSQL = default(StringBuilder);
        SqlCommand objCmd = null;
        SqlDataAdapter dtAdapter = null;
        DataTable dt = null;
        DataSet ds = new DataSet();

        strConnString = WebConfigurationManager.ConnectionStrings["edocConnectionString"].ConnectionString;
        objConn = new SqlConnection(strConnString);
        objConn.Open();
        strSQL = new StringBuilder();
        strSQL.Append("SELECT * ");
        strSQL.Append("FROM officer");
        strSQL.Append("WHERE Username = @Username");

        objCmd = new SqlCommand(strSQL.ToString(), objConn);
        objCmd.Parameters.Add("@Username", SqlDbType.VarChar).Value = Session["Login"];

        dtAdapter = new SqlDataAdapter();
       dtAdapter.SelectCommand = objCmd;
       dtAdapter.Fill(ds);

        dt = ds.Tables[0];

       
        objConn.Close();
        objConn = null;

        if (dt.Rows.Count > 0)
        {
            this.lblText.Text = dt.Rows[0]["EmpCode"].ToString();
            
        }
    }
    

}