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.NET Column: Implementation of Events with Delegates

Posted By:      Posted Date: August 21, 2010    Points: 0   Category :ASP.Net

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Delegates and events in c#.net

People often find it difficult to see the difference between events and delegates. C# doesn't help matters by allowing you to declare field-like events which are automatically backed by a delegate variable of the same name. This article aims to clarify the matter for you. Another source of confusion is the overloading of the term "delegate". Sometimes it is used to mean a delegate type, and at other times it can be used to mean an instance of a delegate type. I'll use "delegate type" and "delegate instance" to distinguish between them, and "delegate" when talking about the whole topic in a general sense.

delegates and events with interface


This is working fine and dandy but I am already starting to incur some issues with readability. I am wondering if there is a documented schema for implementing events and possibly delegates in an interface? Here is what I have so far...


namespace NSMR.Rule { public interface IRule { int pk_rule_id { get; set; } string rule_name { get; set; } DateTime date_created { get; set; } DateTime date_updated { get; set; } string created_by { get; set; } string updated_by { get; set; } string description { get; set; } int pk_facility_id { get; set; } string generated_sql { get; set; } event EventHandler OnRuleCreated; } }






can events exist without delegates

Can events exist without delegates ! either in C# or VB .NET

jQuery Date picker Implementation in ASP.NET

I've posted a wrapper ASP.NET around the jQuery.UI Datepickercontrol. This small client side calendar control is compact, looks nice and is very easy to use and I've added it some time back to my control library.

This is primarily an update for the jQuery.ui version, and so I spend a few hours or so cleaning it up which wasn't as easy as it could have been since the API has changed quite drastically from Marc's original implementation. The biggest changes have to do with the theming integration and the resulting explosion of related resources.

If you want to use this component you can check it out a sample and the code here:

WCF Tutorial - Events and Callbacks

we described how to make a very simple client/server application where clients would call functions on the server through a shared interface. In this tutorial, I'm going to expand that application to allow the server to execute functions on the client by using callbacks. Essentially, this is WCF's mechanism to allow events to be raised from the server to it's connected clients.

Tooltip for GridView Column Headers (ASP.Net)

I just wanted to add auto tooltips for my GridView headers. There are couple of ways but I don't want to use javascript and wanted to use simple 'title' attribute. It took couple of hours to get the working code supporting sortable columns. I thought it will be very useful for others. Here's the code and logic behind it.

Multiple Column Dropdownlist for the ASP.NET DataGrid

Based on my previous control "Multiple Column DropDownList for ASP.NET", I received many emails asking for the same control to be used in the DataGrid for web applications. Here we go.. This control can be used as the regular MS DropDownList in the DataGrid and also as a regular dropdownlist. It has all the properties, like DataTextField, DataValueField, DataSource, SelectedIndex etc. The download file contains the samples both in VB.NET and C#. In this sample, I have used the Northwind database of SQL Server.

Alternating row background for first column of a report


is there a way to make the first column of a report use the an alternating background color? 

I have the background color set for the entire row however it does not work for the first column if the color is set to an expression.  If I just set it to a color i.e. red it works just fine. If I insert a dummy column to the left it works just fine (but the dummy column does not work, presumably because it is first??).

In the file below only the textbox for part number does not show an alternating background.  All others work correctly.

                    <Textbox Name="PartNumber">

How to listen to events within a listview



I've got a listview and I've put a button control in one of the columns, I'm trying to figure out how I have listen to the button click within a certain row, but can't see the button in the dropdown for the IDs I can generate events for.

I'd like to get the primary key of the row that's been clicked on and then run a sql statement against it.

Any help would be appreciated.

Use a column as parameter for a sds in another column; gridview


Hola, I have a gridview which is bound to a sds which returns 7 columns and I added two columns from the GUI.  What I want is to fill up the 9th column with DDLs and these  DDLS will get their data from a different sds which is using a stored procedure with a single parameter.  I created the 9th row, used template field, made the sds for 9th row, the stored_procedure, threw a DDL in Item template and all  I need now is to pass a parameter in the first column to the sds in the 9th column.  I can code this but i'm getting tired of aspx.cs :) and would like to do it from the GUI.

Pass a grid column value to a Modal


Hi, I have a requirement to hide a field called details on a gridview and show it in a jQuery modal dialog when users click on the Customer ID hyperlink. This grid is created programmatically. I will be hiding the details column via the CSS display:none property. Does some one know how can I pass the grid's selected hidden column value to the modal? Here is some of the code I started:

            GridView mygrid = new GridView();
            //.....................................More columns code for the grid

            //Here is where I need to pass the Details column value associated with the customer ID field selected to the Modal and open the Modal dialog.            
            HyperLinkField linkField = new HyperLinkField();
            string[] dataNavigateUrlFields = { "CustomerID" };
            linkField.DataTextField = "CustomerID";

Bug: Does not change column type from nvarchar to ntext


Scenario: If you create a table with a column of type nvarchar, populate it with some content and try to modify it using the WebMatrix editor, from nvarchar to ntext, it does not display any error message or warning that this is not possible. It silently saves and reverts the change, back to nvarchar. Wasted some hours on this issue as I thought my column was ntext, but in fact was still nvarchar.

Expected behavior: It should change to ntext, or if SQL CE doesn't support that, it should notify the user that no change was applied.

Display column from child table. Possible ?



I'am using dnamic entity with EF4. On a list page of a table, I would like to display a column containing information from a child table of the current element. Sample :

Order List :

Order Data | Required Date | Shipped Date | etc... | ... | Customer Name (foreign key with tostring() method override) | Customer Postal Code (Column that I want to add) |

I don't known how to do that. Is it possible ? Maybe I have to to create my own Metadata proxy that will add dynamicly a column on the MetaColumn list of the table.

Does someone have an easier or better idea ?

Thank you for any help.

Rendering data with HTML tags in the DD Gridview for a selected column


I am having trouble finding out where and how to HTML Encode a cell's data on the Dynamic Data (v4.0) gridview of List.aspx.  As a simple case, suppose I have formatted cell data that is A<br/>B in the DB.    Obviously, I want A stacked on B in the cell.

It seems gridView1.HtmlEncode = true has gone away.

So maybe I'll try to catch it on the RowDataBound event:

protected void GridView1_RowDataBound(Object sender, GridViewRowEventArgs e)

            if (e.Row.RowType == DataControlRowType.DataRow)
                // Html Encode the cells


but this event never fires?

Has anyone figured out how to properly render HTML tags data in the List.aspx's GridView1? 

If I figure this out, then I can add a MetaAttribute called something like [EncodeAsHtml(true)] and be on my way.  Thanks!

Filter by Computed Column



After looking for a driver to open legacy dbf drivers to connect, the next level trouble a have is this one:

first, i can retrieve the data but when trying to filter by a parameter (somesc columns) i get an error.

The error says about the database can't determine some blah blah!

The error is a columm tha is formated (  1234  ) about  8 space, fixed. The values in the query appears like that. I resolve this by Trimming Ltrim(ColumnName) and i get this (1234).

Now in SqlExpress, how can i filter by the new Trimmed Expression? (This is a primary key that the DBF use)


SELECT column1, column2, column3


SELECT Ltrim(column1) as NewExp, column2, column3
Where NewExpre = @NewExpres                  -Error-


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