DateTime myDate; if(DateTime.TryParse(txtBirthDate.Text, out myDate)) { //Valid Date } else { //Invalid Date }
Tag: C#
Convert comma separated string into a List in C#
string myList = “9,3,12,43,2”; List<int> intList = myList.Split(‘,’).Select(int.Parse).ToList();
Converting a List to a comma separated string in C#
List<int> list = new List<int>() {1,2,3}; string.Join<int>(“,”, list) Join has generic overloads. It is so much easier to use it in that way to convert your list to the different types.
Convert List to List in one line in C#
string sNumbers = “1,2,3,4,5”; var numbers = sNumbers.Split(‘,’).Select(Int32.Parse).ToList();
Checking multiple contains on one string
new[] {“,”, “/”}.Any(input.Contains) or you can use Regex Regex.IsMatch(input, @”[,/]”);
Default Values for Data Types in C#
Table below shows the default value for the different predefined data types. Type Default sbyte, byte, short, ushort, int, uint, long, ulong 0 char ‘\x0000’ float 0.0f double 0.0d decimal 0.0m bool false object null string null As you can see, for the integral value types, the default value is zero. The default value for […]
Creating Multiline textbox using Html.Helper function in Asp.Net MVC
How to split string and get first (or n-th) value only
string myValueToSplit = “Istanbul, Tokyo, Seoul, Bangkok, Bali, Minsk, Belgrade, Kiev”; var theFirstValue = myValueToSplit.Split(‘,’)[0]; //OUTPUT: theFirstValue = “Istanbul” //You can change [0] as you wish. //For example, if you want to get Kiev, make it [7]
Constructors and Its Types in C#
Constructor is a special method of the class that is automatically invoked when an instance of the class is created is called a constructor. The main use of constructors is to initialize the private fields of the class while creating an instance for the class. When you have not created a constructor in the class, the compiler […]
What does the word ‘new’ mean exactly in C#?
In C# (and many other languages) you will find that you use new often as it is fundamental to using types and classes. The new keyword does pretty much what it says: it will create a new instance of a class or type, assigning it a location in memory. Let me try and illustrate this. Company company; Here […]
How to calculate the sum of the datatable column in asp.net?
To calculate the sum of a column in a DataTable use the DataTable.Compute method. DataTable dt; … int sumValue; sumValue = dt.Compute(“Sum(TheSumColumn)”, string.Empty);
How to run code if not in Debug Mode in C#
Sometimes you want to run your code only when it is not in debug mode. You can use #IF DEBUG code block for this purpose #if DEBUG LogMail(“It is in debug mode, only add a log record.”) #else SendMail(“It is not in debug mode, so you can send e-mail.”) #endif
How to select distinct rows in a datatable in C#
dataTable.DefaultView.ToTable(true, “target_column”); first parameter in ToTable() is a boolean which indicates whether you want distinct rows or not. second parameter in the ToTable() is the column name based on which we have to select distinct rows. Only these columns will be in the returned datatable. If you need to get distinct based on two columns: dataTable.DefaultView.ToTable(boolean, params string[] columnNames)
How to use Stopwatch in C#
The Stopwatch object is often used to measure how long things take. One quick thing to remember here is that it will take the time for everything you do between starting and stopping it, so make sure you only put the actual code you want to time between those.
Using Code Blocks, Mixing Text & C# Code and Comments in Asp.NET MVC Razor
In Razor you can create blocks of code nearly anywhere using @{ }. A block of code doesn’t emit anything into the output, but you can use the block to manipulate a model, declare variables, and set local properties on a view. Be extremely careful about having too much code in a view, however, because […]