สอบถามการบันทึกวันลงในฐานข้อมูล Sql server เก็บจากการล็อกอินเข้าระบบ

using System;
using System.Web;
using System.Data;
using System.Web.Security;

public partial class conference_vdologin : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
        }
    }

    protected void btnOK_Click(object sender, EventArgs e)
    {
        if (CheckAuthenticate(txtUsername.Text.Trim(), txtPassword.Text.Trim()))
        {
            FormsAuthentication.RedirectFromLoginPage("AdminClinic", false);
        }
        else
        {
            ClearList();
        }
    }
       protected void btnCancel_Click(object sender, EventArgs e)
    {
        ClearList();
    }
    #region Method

    private void ClearList()
    {
        txtUsername.Text = "";
        txtPassword.Text = "";
        SetFocusCtrl(txtUsername);
    }
    
    private void SetFocusCtrl(System.Web.UI.Control ctrl)
    {
        string script = "<SCRIPT language=\"javascript\">" + "document.getElementById('" + ctrl.ID + "').focus() </SCRIPT>";
        ClientScript.RegisterStartupScript(this.GetType(), "focus", script.Trim());
    }

    private bool CheckAuthenticate(string Username, string Password)
    {      

        string querystr = "select * from video_emp where ltrim(rtrim(Username))='" + Username.Trim() + "' and ltrim(rtrim(Password)) ='" + Password.Trim() + "'";
        vdoClassUtil cUtil = new vdoClassUtil();
        DataTable dtAgent = cUtil.GetDatatable(querystr);

                       
        if (dtAgent.Rows.Count == 1)
        {

            string strToday = DateTime.Today.ToString("dd-MM-yyyy");
            string strSQLLog = "INSERT INTO video_login (";
            strSQLLog += "\r" + " Username, Status_dtm ";
            strSQLLog += "\r" + ") VALUES (";
            strSQLLog += "\r '" + txtUsername.Text.Trim().ToLower() + "', getdate())";
            cUtil.RunQuery(strSQLLog);
      
           return true;
        }
        else
        {
            return false;
        }
        
    }

  

    #endregion

}