Username and UserType Validation in asp.net using mysql

Login (LID,UName,UPasword,UserType_ID)

UserType(UserType_ID,UserType)

Error   58  The type or namespace name 'UserInformation' could not be found (are you missing a using directive or an assembly reference?)   

public string LogOn(UserInformation objLogOnUserInformation)
{
   // ConnectionManager conCm = new ConnectionManager();
   try
   {
      MySqlConnection con = conn.Open();
      MySqlCommand cmd, cmdOne;
      MySqlDataReader dr;
      // SqlDataReader dr;
      string _str = "U";
      cmd = new MySqlCommand("select LID  from Credentials", con);
      dr = cmd.ExecuteReader();

      while (dr.Read())
      {
         //checking user name is present in database
         if (dr.GetValue(0).ToString() == objLogOnUserInformation.UserId)
         {
            dr.Close();
            //retriving Password for the existing user
            cmd = new MySqlCommand("select Pasword  from login where LID='" + objLogOnUserInformation.UserId + "'", con);
            dr = cmd.ExecuteReader();

            while (dr.Read())
            {
               //checking the password is matching with the database
               if (dr.GetValue(0).ToString() == objLogOnUserInformation.Password)
               {
                  dr.Close();
                  cmd = new MySqlCommand("select UserType_ID  from login where LID='" + objLogOnUserInformation.UserId + "'", con);
                  dr = cmd.ExecuteReader();

                  while (dr.Read())
                  {
                     //checking user type 
                     if (dr.GetValue(0).ToString() == _str)
                     {
                        dr.Close();
                        cmdOne = new MySqlCommand("select UName from login where LID='" + objLogOnUserInformation.UserId + "'", con);
                        dr = cmdOne.ExecuteReader();
                        dr.Read();
                        objLogOnUserInformation.SessionUserName = dr.GetValue(0).ToString();
                        dr.Close();
                        //if usertype is customer, U is returned
                        Response.Redirect("gallery.aspx");
                     }
                     else
                     {
                        dr.Close();
                        cmdOne = new MySqlCommand("select UName from login where LID='" + objLogOnUserInformation.UserId + "'", con);
                        dr = cmdOne.ExecuteReader();
                        dr.Read();
                        objLogOnUserInformation.SessionUserName = dr.GetValue(0).ToString();
                        dr.Close();
                        //If usertype is Admin, A is returned
                        Response.Redirect("Reports.aspx");
                     }
                  }
               }
               else
               {
                  return " Either User Name or Password is not Valid";
               }
            }
         }
      }
   }
   catch
   {
   }
}