关于用户名登陆的问题？在线等。
string username = Request.Form["username"].ToString();
  string userpsd = Request.Form["userpsd"].ToString();
  // Response.Write("登录的用户名为" + username + "用户密码" + userpsd);

  string strCon1 = "Data Source =" + Server.MapPath("wjx.accdb");
  string strCon = "Provider=Microsoft.ACE.OLEDB.12.0;Persist Security Info=false;" + strCon1;
  // OleDbDataAdapter myCommand = new OleDbDataAdapter("SELECT * FROM azhou ", strCon);
  OleDbDataAdapter myCommand = new OleDbDataAdapter("select * from AdminUser where 用户名='" + username + "' and 密码='" + userpsd + "'", strCon);
   

请问接下来我该怎么写。。头大

------解决方案--------------------
OleDbConnection cn = new OleDbConnection(strCon );
cn.Open();
String sql = "select * from AdminUser where 用户名=@name and 密码=@pwd";
OleDbCommand cmd = new OleDbCommand(sql, cn);
cmd.Parameters.AddWithValue("@name", username );
cmd.Parameters.AddWithValue("@pwd", userpsd );
OleDbDataReader dr = cmd.ExecuteReader();
if(!dr.HasRows)
{
 //用户不存在
}