There are three ways to check whether IEnumerable<> or List<> type is empty / null or not. == NULL .Any() .Count() In any case, you always want to combine “== null” and, either “.Any()” or “.Count()”, with OR (“||”) operator. In addition, you want to put “== null” before the other condition. The reason for this is, “if” condition goes from left to right. So, if the list object is null, it will not go to the second check,…
A program iterates over a collection. The index of each element is not needed. Only the elements are needed. With foreach we access just the elements. A foreach-loop, this is the easiest, least error-prone loop. It is preferred in many program contexts. Here are some samples: using System; class Program { static void Main() { string[] pets = { “dog”, “cat”, “bird” }; // … Loop with the foreach keyword. foreach (string value in pets) { Console.WriteLine(value); } }…
Analyze Navigate Backward Shift+Alt+3 Navigate Forward Shift+Alt+4 Architecture New Code Map Ctrl+\, Ctrl+O New UMLor Layer Diagram Ctrl+\, Ctrl+N Architecture Context Menus Add Node Ins Both Dependencies B Incoming Dependencies I Outgoing Dependencies O New Comment Ctrl+Shift+K Ctrl+E, C Remove Del Rename F2 Build Build Solution Ctrl+Shift+B Cancel Ctrl+Break Compile Ctrl+F7 Run Code Analysison Solution Alt+F11 Class Diagram Collapse Num – Expand Num + Class View Context Menus Properties Alt+Enter Misc Commit All Edits Shift+Alt+U Move Left Edgetotheleft Ctrl+Shift+,…
I am creating an AddIn for Outlook and I want to create DateTimePicker where I want to select a Time in interval of 30 minutes. In KeyDown event where the user presses up or down it will increment or decrement the time in interval of 30 minutes.
LINQ to SQL in C# – Cheat Sheet Database context & database create var db = new MyDataContext(@”server=.\SQLEXPRESS;database=my;integrated security=SSPI”); if (!db.DatabaseExists()) db.CreateDatabase(); Select one Insert var only = db.Customers.SingleOrDefault(c => c.CustID == “CHIPS”); var first = db.Customers.FirstOrDefault(c => c.CustID == “CHIPS”); var customer = new Customer() { CustID = “CHIPS”, CompanyName = “Mr. Chips” }; db.Customers.InsertOnSubmit(customer); db.SubmitChanges(); – – – – – – – – – – – – – – – – – – – – –…
C# for Java Developers – Reference List Source: download.microsoft.com
C# is a strongly-typed language. Before a value can be stored in a variable, the type of the variable must be specified, as in the following examples: int a = 1; string s = “Hello”; XmlDocument tempDocument = new XmlDocument(); Note that the type must be specified both for simple, built-in types such as an int, and for complex or custom types such as XmlDocument. C# includes support for the following built-in data types: Data Type Range byte 0…
ASP and VBScript Cheat Sheet
