C#z about accessing the database null and 0

Requirements: When registering a user, for the age, address, name and other fields if the customer does not want to fill in, this indicates that the value of these fields is "Do not know", However, if the database is stored according to the general

C#windows Application Packaging (vs2010+sqlserver2008)

c#windows Application Packaging (vs2010+sqlserver2008) Development environment: Vs2010+sql Server 2008 Operating system: Win7_32bit flagship edition Development language: C # Project name: Student Homestay Management

C # complete solution of important parts of OOP,

C # complete solution of important parts of OOP, If you have patience, please take a look. You must have something to use. Please trust me!   What you see is only a part of it, and it has not been updated yet. It is to be continued ....The

Identity Authentication in nancy and nancy Authentication

Identity Authentication in nancy and nancy Authentication In nancy, identity authentication can be divided into basic, form, token, and stateless. basic and form are not mentioned here. If the identity is saved using cookies, note the following:

Parallel development and learning 1-parallel plinq and parallel development

Parallel development and learning 1-parallel plinq and parallel development I have been reading articles from yuanyou these two days. 8-day interactive parallel development-Use of plinq on the third day I practiced the first instance and found

XML is formatted using XSL (XML is collapsed to custom nodes), xmlxsl

XML is formatted using XSL (XML is collapsed to custom nodes), xmlxsl  Introduction Sometimes we want to see the XML files generated by the system (such as Project files in XML format). If the file structure is simple, our browser looks more

JSON description. net, json description. net

JSON description. net, json description. net Previously, json was hard to grasp and wasted a lot of time searching for json-related conversion problems. All I know is to serialize and deserialize json, but it is too troublesome, so we are looking

How to prepare for C #: Object-oriented <1> 〉,

How to prepare for C #: Object-oriented 〉,1. CLR load the compilation source file   Static void () {for (int I = 0; I Note 1. the exit of the break indicates that the for loop is not executed no matter J is equal to 3 or 4. Note 2. When continue

About the application instance of Baidu editor UEditor (1.4.3) in C #. NET,

About the application instance of Baidu editor UEditor (1.4.3) in C #. NET, First, go to the Baidu UEditor official website to download version 1.4.3. net. Http://ueditor.baidu.com/build/build_down.php? N = ueditor & v = 4154_3-utf8-net 1. Copy

[Original] Old repeat: only configure parameters to achieve oau2login, old repeat oau22.

[Original] Old repeat: only configure parameters to achieve oau2login, old repeat oau22. In fact, this component has been written for a long time. For a few months, it has been put on the MrHuo studio and has always been said to be organized. It is

C # inline-hook/api-hook,

C # inline-hook/api-hook, I checked the relevant C # documents, but I did not find any information about api-hook. Including the application library. Therefore, I wrote a set of inline-hook libraries to support x64 and x86 based on Common clr

Note: Quartz StartNow () is invalid. quartzstartnow

Note: Quartz StartNow () is invalid. quartzstartnow Today, a problem occurs. When the scheduler starts, it cannot start to execute the task immediately. The Code is as follows: Var trigger = TriggerBuilder. Create (). StartNow () // This is invalid.

[Solution] NPOI Excel, solutionnpoi

[Solution] NPOI Excel, solutionnpoi NPOI is the. NET version of the POI project. POI is an open-source Java project for reading and writing Microsoft OLE2 component documents such as Excel and WORD.With NPOI, you can read and write WORD/EXCEL

We also talk about C # Json, from Json strings to class code,

We also talk about C # Json, from Json strings to class code,Reading directory      Json conversion object Since. net 4.0, Microsoft has provided a complete set of solutions for json processing. Here, there is how to convert a json string into a

III. C # Operator and Control Flow,

III. C # Operator and Control Flow,Operators are generally divided into three categories: unary operators, binary operators, and ternary operators. Their corresponding operands are 1, 2, and 3. Combination and priority order. Binary operations

In all regions, you can issue a free invoice,

Chengdu invoicing,   [13538017315 Mr. Dai QQ2016771784], unified industry and business. In the first half of this year, the inventory and transaction volume of the property market increased, the project sales cycle extended, and the turnover

Attention should be paid to the usage of the Dictionary in C,

Attention should be paid to the usage of the Dictionary in C, A system that has been installed and used to handle large data volumes. This system was reported for the first time in several months:「 Added a category containing the same index 」An item

C # obtain the first day of the current month and the last day to calculate the number of days between the two dates,

C # obtain the first day of the current month and the last day to calculate the number of days between the two dates, Obtain the first and last days of the current month. DateTime now = DateTime. Now; DateTime firstDay = new DateTime (now. Year,

[C #] determines whether a class implements multiple methods and Performance Analysis for an interface,

[C #] determines whether a class implements multiple methods and Performance Analysis for an interface, IEntity is an interface, and Entity is the class that implements the IEntity interface: interface IEntity{ int Id { get; set; }}public class

C # strongly smash file code sharing, used during upgrade,

C # strongly smash file code sharing, used during upgrade, The file shredder of 360 is still very powerful. During the upgrade of winform on our client, some files must be forcibly deleted and then downloaded and updated, if the deletion fails, the

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