像asp.net中的会话一样，如何使用c＃登录Windows应用程序？

Question

I am developing an web application, so now i have a requirement to develop a login page so in my app nearly 20 forms and 1 master page.

So i designed 1 login form i stored the details in sql db and i checked all the credentials everything is working.

But when the user login from login page i showed the master form in that nearly 20 forms are there with linklabel. So when the master page is opened i showed his name on top of the master page. It is fine. I showed this name

Login form:

  master MasterObj = new master();

  MasterObj.values = this;

  MasterObj.Show();

In master form:

  string login values;

   label1.text=values.txtusername.text; 

So i successfully dispalyed message on this master form.

So the subforms also there is linklabel to redirect master form, then there is a problem to dispaly name "object reference cannot instance of an object". i know why this error came? beacause i am not intialize the name value from the subform.

Which is the best way to get then name of the user to all the win forms in my application thanks.

Answer 1

You can create a Loginclass that handles the Login User ID , and once logged you can set the value

 public static LoggedUser{
    public Static string userid;
    }

in each form on load you can check the userid if not empty .

or you can get benefit from the settings property

    Settings.Default.UserID = UserID.Text;
        Settings.Default.Save();

Answer 2

You can create a static variable in Program.cs file and then you can access it from through out the application like

declare the variable in program .cs file as

public static string LoggedUser="";

assign the username to it like

Program.LoggedUser=txtUserName.Text;

And Accessing it through out the application is like

string UserName=Program.LoggedUser.ToString();