asp.net can not select multiple items in the DropDownList reason analysis and solution _ practical skills

Sample code: Copy Code code as follows: BULKSTOCKBLL BLL = new BULKSTOCKBLL (); DataSet ds = BLL. Getbulkstock (); This.ddl_BulkStock.DataTextField = "Name"; This.ddl_BulkStock.DataValueField = "ID";

Asp. NET access to the path "xxxxx" solution Summary _ Practical Tips

Under Windows 2003, an error occurred while running the Web application: The server was unable to process the request,--> denied access to the path "C:/temp/mytest.txt" Note: An unhandled exception occurred during the execution of the current WEB

asp.net post form save page state and output source code implementation Method _ Practical skills

HTML page Copy Code code as follows: validaterequest= "False"%> Extract HTML source after submission (keep state) User Control Copy Code code as follows: User

asp.net file breakpoint Extension Implementation Code _ Practical skills

Here I add an HTTP header to the output stream through the AddHeader method in the response class. In the HTTP header, it consists of the header and the body information. The two lines are separated by a blank line. This uses a range segment in the

asp.net textbox JavaScript implements enter and Ctrl+enter interchange text boxes to send messages with line wrapping (similar to QQ) _ Practical Tips

1, perhaps a little beginner, I hope the master do not "spray" me, because I know not everyone is a master, I am afraid of the experts said I loaded 13; 2, if there is anything wrong place, but also hope that you must be open-minded to learn, if

A brief summary of several methods of ASP.net split string-practical tips

Here are a few: 1, the simplest and most commonly used method, with a specified character split open vs.net to create a new console project. Then enter the following program under the main () method. Copy Code code as follows:

Imitate click event in IE and Firefox and submit to new window summary (asp.net) _ Practical Tips

First look at the code that simulates the Click event: Copy Code code as follows: ok In fact, I am in the page to trigger a click event in order to submit the form, in the form of a new window open, we often ignore some

ASP.net calculates how many times each number appears in a string of numbers _ Practical tips

Next, the string is split, each character is inserted into a table variable, and finally grouped by using GROUP by. Copy Code code as follows: Calnumofchtinstr SET ANSI_NULLS on Go SET QUOTED_IDENTIFIER ON Go -- ====================

asp.net calculating the number of occurrences of strings in a string _ Practical tips

To achieve the first step, you need to split the string into an array, and the function you want to use is split (): Copy Code code as follows: string[] arr = s.split (', '); The second step is to instantiate with dictionary (

asp.net list all documents under a folder, including files in subdirectories _ Practical tips

Copy code code as follows: protected void Page_Load (object sender, EventArgs e) { ///Specify Destination Folder String directory = @ "C:\Windows\Microsoft.NET\Framework\v3.5"; Iterationfile (directory); }

ASP.net verification Code of simple production (vb.net+c#) _ Practical skills

A general method for verifying code effects on a Web site is: 1 Use HttpHandler (general handler) to draw the graph of random verification code, and generate random code, and output to the outputstream of the page. 2 The page uses the asynchronous

asp.net program Optimization Minimize Database connection operation _ practical skills

The project is completed with my own design code and integrates the tests. The problem occurs when you initialize the data. It is very slow to accept data at the beginning of the client. Test environment, the database server is deployed abroad, the

Asp.net+ajax verify the existence of the user's implementation code _ practical skills

Requirements: do an AJAX login Main technical points: jquery Ajax and Blur events When the user name input box loses the focus, it triggers the Blur event, then makes an AJAX request, obtains the result (true or false), and if the request result

The use of ASP.net DoDragDrop Method-practical skills

The definition in the class library is: Copy Code code as follows: [Uipermissionattribute (SecurityAction.Demand, Clipboard = Uipermissionclipboard.ownclipboard)] Public DragDropEffects DoDragDrop ( Object data, DragDropEffects

asp.net picture add watermark anti-theft Chain Implementation Code _ Practical skills

First build a class: Copy Code code as follows: Using System; Using System.Collections.Generic; Using System.Linq; Using System.Web; Using System.Drawing; Summary description of Class1 public class Class1:ihttphandler//Calling

asp.net to obtain the parameters of the system to achieve code _ practical skills

Copy Code code as follows: Operating system name public string Getosinfo () { return System.Environment.OSVersion.Platform.ToString (); } Operating system version public string getosversion () { return

asp.net code to get pictures in a folder _ Practical tips

Front desk: Copy Code code as follows: Cellspacing= ">" " width= "" height= "" border= "0" > Background code: Copy Code code as follows: String path = Server.MapPath ("img");//Get the path to the IMG folder

Implementing code for downloading files in asp.net-practical tips

This is the author is often asked a question, how to download the file through the ASP.net, this problem can be small, we first from the small start. The easiest way to get the user to download a file is through the Response.Redirect

Code _ Practical Tips for recursively outputting the type and ID of all controls on a asp.net page

Write a method: Copy Code code as follows: private void Displayallcontrol (control control, int step) { foreach (Control ctl. Controls) { string s = new string ('-', step * 4) + ctl. GetType (). Name + "" + Ctl.id + ""; Response.Write

Asp. NET operation database Basic steps sharing _ Practical skills

1.ASP. NET Operations Database: Asp. NET data manipulation methods commonly used: A. ExecuteReader () Returns a SqlDataReader object or OleDbDataReader object, with each return or operation directing a record to be saved in the server's memory. In

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