User control example

A simple example of user control is used as a user control for user login.
It is a very common problem for users to log on to a system. Here I want to use such a problem as a user control to facilitate various users.
1. Create a new Web user control in the project. The added name is FrLogin. ascs.
2. Drag and drop the required control to the web. For example, two labels, two TextBox, and one Button are named lblUserName, lblPassword, txtUserName, txtPassword, and btnLogin.
3. Add the Property Code of two TextBox
Public string UserName
{
Get {return this.txt UserName. Text ;}
Setincluthis.txt UserName. Text = value ;}
}
Public string Password
{
Get {return this.txt Password. Text ;}
Setincluthis.txt Password. Text = value ;}
}
In this way, you can get or set their values when dragging your user control to another Web page.
4. Add a Button event proxy
Double-click your btnLogin to generate the corresponding event processing function.
Private void btnRegister_Click (object sender, System. EventArgs e)
{}
Then declare the event proxy
Public delegate void OnRegisterClickedHandler (object sender, System. EventArgs e); note that the signature here must be correct.
Public event OnRegisterClickedHandler OnRegisterClicked;
5. Modify the btnRegister_Click function
Add the following code to execute the proxy:
If (OnRegisterClicked! = Null)
OnRegisterClicked (sender, e );
By now, your user control has been set. Is it easy? Because the. net environment has helped you complete a lot of background operations.
6. Set FrLogin. drag and drop ascs to the page you want to reference ,. net has generated <% @ Register TagPrefix = "uc1" TagName = "FrLogin" Src = "FrLogin. ascx "%>
<Uc1: FrLogin id = "FrLogin1" backColor = "Black" runat = "server"> </uc1: FrLogin>. The defect here is that it does not help you generate protected FrLogin FrLogin1 in TestPage. aspx. cs; you need to manually add the code. Note that the control name must be consistent with that in the html definition.