The intention of "using" is to give developers a guaranteed way to make sure that resources get disposed. From MSDN: A using statement can be exited either when the end of the using statement is reached or if an exception is thrown and control leaves the statement block before the end of the statement.

2013年7月30日 · The proper or best practice way of using DBContext variable is with the Using. using (var db = new MyEntities()) { return db.Items.Where(it => it.ItemId == itemId && !it.IsDeleted).FirstOrDefault(); } The benefit is many things are done automatically for us. For example once the block of code is completed the dispose is called.

2010年6月20日 · Is this possible using a using statement C# SQL? private static void CreateCommand(string queryString, string connectionString) { using (SqlConnection connection = new SqlConnection( connectionString)) { SqlCommand command = new SqlCommand(queryString, connection); command.Connection.Open(); …

2017年4月5日 · If you are using Powershell and you want to install .NET service you can use Install-Service module. It is a wrapper for InstalUtil tool. It exposes 3 commands. Install-Service - invokes InstallUtil.exe pathToExecutable command; Install-ServiceIfNotInstalled - first it checks if service is installed if not perform the method Install-Service

2016年9月8日 · If you are using parametrized Stored procedure: Pass in comma separated string; Use special function to split comma separated string into table value variable; Use INNER JOIN ON t.PersonName = newTable.PersonName using a table variable which contains passed in …

2010年3月21日 · (1) That the bool call on the operands has to return True or False isn't completely correct. It's just the first operand that needs to return a boolean in it's __bool__ method:

Using parameters in batch files: %0 and %9 Batch files can refer to the words passed in as parameters with the tokens: %0 to %9 . %0 is the program name as it was called. %1 is the first command line parameter %2 is the second command line parameter and so on till %9.

Syntax strictly depends on which SQL DBMS you're using. Here are some ways to do it in ANSI/ISO (aka should work on any SQL DBMS), MySQL, SQL Server, and Oracle. Be advised that my suggested ANSI/ISO method will typically be much slower than the other two methods, but if you're using a SQL DBMS other than MySQL, SQL Server, or Oracle, then it ...

2015年10月28日 · In HTML using   for space, I get one space in the output. If my requirement needs more spaces say 100, then how to make that tag efficient? Should I type   100 times?

2013年6月22日 · To run a python script in a python shell such as Idle or in a Django shell you can do the following using the exec() function. Exec() executes a code object argument. A code object in Python is simply compiled Python code. So you must first compile your script file and then execute it using exec(). From your shell: