Generating class through C# code

namespace killercodes_in.CodeGeneration
{
    public class GenerateClass
    {
        public void Generate()
        {
            //output file name
            string fileName = "HelloWorld.cs";

            //text writer to write the code
            TextWriter tw = new StreamWriter(new FileStream(fileName, FileMode.Create));

            //code generator and code provider
            ICodeGenerator codeGenerator = new CSharpCodeProvider().CreateGenerator();
            CSharpCodeProvider cdp = new CSharpCodeProvider();
            codeGenerator = cdp.CreateGenerator();

            //namespace and includes
            CodeNamespace Samples = new CodeNamespace("Samples");
            Samples.Imports.Add(new CodeNamespaceImport("System"));

            //declare a class
            CodeTypeDeclaration Class1 = new CodeTypeDeclaration("HelloWorld");
            Samples.Types.Add(Class1);
            Class1.IsClass = true;

            //reference to a method - writeHelloWorld
            CodeMethodReferenceExpression Method1Ref = new CodeMethodReferenceExpression();
            Method1Ref.MethodName = "writeHelloWorld";
            CodeMethodInvokeExpression mi1 = new CodeMethodInvokeExpression();
            mi1.Method = Method1Ref;

            //constructor for the class
            CodeConstructor cc = new CodeConstructor();
            cc.Attributes = MemberAttributes.Public;
            cc.Statements.Add(mi1);
            Class1.Members.Add(cc);

            //method - writeHelloWorld
            CodeMemberMethod Method1 = new CodeMemberMethod();
            Method1.Name = "writeHelloWorld";
            Method1.ReturnType = new CodeTypeReference(typeof(void));
            //Method1.Parameters.Add(new CodeParameterDeclarationExpression(typeof(string), "text"));
            CodeMethodInvokeExpression cs1 = new CodeMethodInvokeExpression(new CodeTypeReferenceExpression("System.Console"), "WriteLine", new CodePrimitiveExpression("Hello World!!"));
            Method1.Statements.Add(cs1);
            Class1.Members.Add(Method1);

            //method - Main
            CodeEntryPointMethod Start = new CodeEntryPointMethod();
            Start.Statements.Add(new CodeSnippetStatement("HelloWorld hw = new HelloWorld();"));
            Class1.Members.Add(Start);

            //generate the source code file
            codeGenerator.GenerateCodeFromNamespace(Samples, tw, null);

            //close the text writer
            tw.Close();

            RunClass sampleRun = new RunClass();
        }
    }
}

Creating custom workflow in CRM 2015

LINQ to Lambda

As we know the LINQ is a language integrated query introduced in visual studio 2008 which offered an compact, and intelligible syntax for manipulating data & objects. Also Lambda expressions are introduced which is like an anonymous function that can be used to write local functions, delegates and expression tree. The below are few examples as how to modify the LINQ expression to Lambda.

Filtering

//Linq
    var column = from o in Orders
                 where o.CustomersId = 45
                 select o;
/* can be converted to Lambda as */
//Lambda
    var column = Orders.Where(o => o.CustomersId == 45);