Using EventHandler

Declaration: 

        public event EventHandler UserSaved;

        public void OnUserSaved()

        {       

            if (UserSaved != null)       

            {       

               UserSaved(this, EventArgs.Empty);       

            }       

        }   

 

Event Trigger with parameter:

public void OnCustomerSelected(string customerBusinessKey)          
         {             
  if (!this.CustomerSelected.IsNotNull()) return;             
  var e = new CustomerEventArgs

                 {

                  CustomerBusinessKey = customerBusinessKey

                 };             
         

      this.CustomerSelected(this, e);         

          

}

Using Delegate

public delegate void CreateUserControlValidated(object sender, ValidationEventArgs e);

public event CreateUserControlValidated Validated;

 

public class ValidationEventArgs : EventArgs

{

    public virtual IList<string> ClientExceptionList { get; set; }

}

 

Useful Articles: 1

private int IsIntegerInCSharp(string intString)

{

    int intReturn;

    if (!Int32.TryParse(intString, out intReturn))

    {

        throw new Exception("Invalid integer");

    }

    return intReturn;

}

1. Implement ASP.NET AJAX with the UpdatePanel control
2. Creating a Simple ASP.NET Page with Multiple UpdatePanel Controls
3. UpdatePanel Tips and Tricks
4. ScriptManager Enables AJAX In Your Web Apps
5. Drag and Drop with ASP.NET AJAX
6. New AJAX Support For Data-Driven Web Apps
7. AJAX Application Architecture, Part 1
8. AJAX application architecture, Part 2
9. Managing the User Experience in AJAX
10. Lazy Loading the ASP.NET AJAX TabContainer Control 
11. More Sample AjaxControlToolkit TabContainer Themes
12. ASP.NET AJAX TabContainer – Tips and Tricks 
13. How To: Lazy-load TabPanel's within the AjaxControlToolkit's TabContainer Control
14. Delay Load an UpdatePanel
15. Customize Controls with AJAX Extenders
16. Modal Dialog Boxes with AJAX
17. Drag and Drop with ASP.NET AJAX
18. Creating Sophisticated Animations with the Microsoft AJAX Library
19. ASP.NET AJAX Extender for multicolumn drag and drop
20. The Ever-Useful $get and $find ASP.NET AJAX Shortcut Functions
21. Documentation for: ASP.NET Ajax Version Ajax 1.0,  MSDN1 & MSDN2
22. Delayed Content Loading Using the AJAX.NET Timer and UpdatePanel
    
23. ASP.NET/ AJAX Page Loader Progress Bar/ Splash Screen
    

if (!this.Page.IsClientScriptBlockRegistered("hideMessage"))

{ this.Page.RegisterStartupScript("hideMessage", 

	"<script>document.getElementById('" + pnlMessage.ClientID + "').style.display = 

				 'none'</script>;"); }

protected override void OnInit(EventArgs e)

{

    btnSearch.Attributes.Add("onclick", "javascript:" + btnSearch.ClientID + ".disabled=true;" 

			+ this.Page.GetPostBackEventReference(btnSearch));

    base.OnInit(e);

}

or

Disable ASP Button on Submit and capture the PostBack OnClick Event

1. ASP.NET Custom Error Pages
2. Error Handling in ASP.Net Ajax Applications
3. Handling exceptions in ASP.NET Ajax
4. Asp.net Ajax Exception Logging
5. How to improve ASP.NET AJAX error handling
6. Asynchronous error handling change in ASP.NET AJAX 3.5
7. ScriptManager - AsyncPostBackErrorMessage Property
8. Tip/Trick: Handling Errors with the UpdatePanel control using ASP.NET AJAX
9. Error Handling in ASP.NET
10. Sys.WebForms.PageRequestManagerParserErrorException - what it is and how to avoid it
11. Configuring Visual Studio to Debug .NET Framework Source Code
12. ELMAH: Error Logging Modules and Handlers for ASP.NET (and MVC too!)

public static T FindControl<T>(this Control control, string controlId) where T : Control

{

    return (T)control.FindControl(controlId);

}

1)    char[] delimiterChars = { ':'};
       string[] args = t.Split(delimiterChars);

2)    string[] args = t.Split(new char[] {':'});

If we assign a nullable object like DateTime to null like below,

nextRunDateTime = null;

DateTime? time = nextRunDateTime.Value;

We get an error of, Nullable object must have a value.

But if we use the same example above without the Value object:

nextRunDateTime = null;

DateTime? time = nextRunDateTime;

Then no error is generated

|| Operator

x || Y (if x is true, y is not evaluated (because the result of the OR operation is true no matter what the value of y might be). This is known as "short-circuit" evaluation).

In other words, if x is false, then evalute y.

&& Operator

x && y (if x is false, y is not evaluated (because the result of the AND operation is false no matter what the value of y may be). This is known as "short-circuit" evaluation).

In other words, if x is true, then evalute y.