怎么用登录的用户名作为条件修改用户信息?

using System;
using System.Collections.Generic;
using System.Text;
using System.Data;
using System.Data.SqlClient;
using Model;
using DBUtility;
using Utility;namespace DAL
{
   public class datasql
    {       public void updatauser(UserInfo userInfo)
       {           SqlParameter[] parms = new SqlParameter[]
           {
             
               new SqlParameter("@p_name",SqlDbType.VarChar,50),
               new SqlParameter("@p_sex",SqlDbType.VarChar,50),
               new SqlParameter("@p_e_mail",SqlDbType.VarChar,50),
               new SqlParameter("@p_nowplace",SqlDbType.VarChar,50),
               new SqlParameter("@p_birthday",SqlDbType.DateTime),
               new SqlParameter("@p_province",SqlDbType.VarChar,50),
               new SqlParameter("@p_city",SqlDbType.VarChar,50),
           };           parms[0].Value = userInfo.Name;
           parms[1].Value = userInfo.Sex;
           parms[2].Value = userInfo.E_mail;
           parms[3].Value = userInfo.Nowplace;
           parms[4].Value = userInfo.Birthday;
           parms[5].Value = userInfo.Province;
           parms[6].Value = userInfo.City;           sqlhelper.RunProc("Updatebaseinfo", parms);
       
       }
    }  
}
怎么用登录的用户名作为条件修改用户信息?