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Articles by Nizamuddin Siddiqui
Page 120 of 196
How to resize an Image C#?
A bitmap consists of the pixel data for a graphics image and its attributes. There are many standard formats for saving a bitmap to a file. GDI+ supports the following file formats: BMP, GIF, EXIF, JPG, PNG and TIFF. You can create images from files, streams, and other sources by using one of the Bitmap constructors and save them to a stream or to the file system with the Save method.In the below code CompressAndSaveImageAsync Method Compresses the images and saves in the path Mentioned.The new image name will be a combination of desktop userId and dateTimeExampleprivate async Task CompressAndSaveImageAsync(Bitmap ...
Read MoreHow can I limit Parallel.ForEach in C#?
Parallel ForeachParallel.ForEach loop in C# runs upon multiple threads and processing takes place in a parallel way. Parallel.ForEach loop is not a basic feature of C# and it is available from C# 4.0 and above To use Parallel.ForEach loop we need to import System.Threading.Tasks namespace in using directive.ForeachForeach loop in C# runs upon a single thread and processing takes place sequentially one by one. Foreach loop is a basic feature of C# and it is available from C# 1.0. Its execution is slower than the Parallel.Foreach in most of the cases.Example 1static void Main(string[] args){ List alphabets = new ...
Read MoreWhat is the best way to convert seconds into (Hour:Minutes:Seconds:Milliseconds) time in C#?
DateTimeDateTime is a structure of value Type like int, double etc. It is available in System namespace and present in mscorlib.dll assembly.It implements interfaces like IComparable, IFormattable, IConvertible, ISerializable, IComparable, IEquatable.DateTime contains properties like Day, Month, Year, Hour, Minute, Second, DayOfWeek and others in a DateTime object.TimeSpanTimeSpan struct represents a time interval that is difference between two times measured in number of days, hours, minutes, and seconds.TimeSpan is used to compare two DateTime objects to find the difference between two dates. TimeSpan class provides FromDays, FromHours, FromMinutes, FromSeconds, and FromMilliseconds methods to create TimeSpan objects from days, hours, minutes, seconds, ...
Read MoreWhat is an alternative to string.Replace that is case-insensitive in C#?
Replace() method is a string method. This method is used to replace all the specified Unicode characters or specified string from the current string object and returns a new modified string. This method can be overloaded by passing arguments to it.Example 1To replace even the case sensitive charaters Regular expressions provide a powerful, flexible, and efficient method for processing text. The extensive pattern-matching notation of regular expressions enables you to quickly parse large amounts of text to:Find specific character patterns.Validate text to ensure that it matches a predefined pattern (such as an email address).Extract, edit, replace, or delete text substrings.Add ...
Read MoreHow to parse a string into a nullable int in C#?
C# provides a special data types, the nullable types, to which you can assign normal range of values as well as null values.C# 2.0 introduced nullable types that allow you to assign null to value type variables. You can declare nullable types using Nullable where T is a type.Nullable types can only be used with value types.The Value property will throw an InvalidOperationException if value is null; otherwise it will return the value.The HasValue property returns true if the variable contains a value, or false if it is null.You can only use == and != operators with a nullable type. ...
Read MoreWhat are the benefits to marking a field as readonly in C#?
The readonly keyword is used to declare a member variable a constant, but allows the value to be calculated at runtime. This differs from a constant declared with the const modifier, which must have its value set at compile time. Using readonly you can set the value of the field either in the declaration, or in the constructor of the object that the field is a member of.The 'readonly' modifier can be used in a total of four contexts:Field declarationReadonly struct declarationReadonly member definitionRef read only method returnWhen we use the field declaration context, we need to know that the ...
Read MoreHow to find the distance among matrix values in R?
Finding the distance among matrix values means that we want to find the distance matrix and it can be directly found by using dist function with the matrix name. For example, suppose we have a matrix of size 5x5 named as M then the distance matrix can be calculated as dist(M).Example1M1
Read MoreHow to plot the X-axis labels on the upper-side of the plot in R?
By default, the X−axis labels are plotted on the bottom−axis of the plot and that is referred to as the first axis of axis 1, the second axis is the axis on the left−side, the third axis is the axis on the upper side of the plot, and the fourth axis is on the right−side of the plot. If we want to plot the X−axis labels on the upper−side of the plot then we can use xaxt="n" inside the plot function then define axis for upper−side using axis(3) with semi−colon.Example1x
Read MoreHow to add a data frame inside a list in R?
A list may contain many objects such as vector, matrix, data frame, list etc. In this way, we can have access to all the necessary objects at the same time. If we want to add a data frame inside a list then we can use the length of the list. For example, if we have a list defined as List and we want to add a data frame df to the List then it can be added as follows −List[[length(List)+1]]
Read MoreHow to perform group-wise linear regression for a data frame in R?
The group−wise linear regression means creating regression model for group levels. For example, if we have a dependent variable y and the independent variable x also a grouping variable G that divides the combination of x and y into multiple groups then we can create a linear regression model for each of the group. In R, we can convert data frame to data.table object, this will help us to create the regression models easily.Example Live DemoConsider the below data frame −G1
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