C#

1. C# Styles.Render

if your folder path is
Content/Kendo
and if you use  render as below
@Styles.Render("~/Content/Kendo")
It will not load. Because path and folder name is same.
You have to use different name  like below

@Styles.Render("~/Content/Kendocss")

2. MVC Identity add custom role

public void Configuration(IAppBuilder app)   
{   

  ConfigureAuth(app);   
  createRolesandUsers();   
}   
   

//In this method we will create default User roles and Admin user for login   

private void createRolesandUsers()   

{   

     ApplicationDbContext context = new ApplicationDbContext();   

     var roleManager = new RoleManager<IdentityRole>(new RoleStore<IdentityRole>(context));   

     var UserManager = new UserManager<ApplicationUser>(new UserStore<ApplicationUser>(context));   

   

//In Startup iam creating first Admin Role and creating a default Admin User    

    if (!roleManager.RoleExists("Admin"))   

    {   

       //first we create Admin rool   

       var role = new Microsoft.AspNet.Identity.EntityFramework.IdentityRole();   

       role.Name = "Admin";   

       roleManager.Create(role);   

   
//Here we create a Admin super user who will maintain the website             

       var user = new ApplicationUser();   

       user.UserName = "UserName";   

       user.Email = "sample@gmail.com";   

       string userPWD = "12345";   

   

       var chkUser = UserManager.Create(user, userPWD);   

   

//Add default User to Role Admin   

        if (chkUser.Succeeded)   

        {   

           var result1 = UserManager.AddToRole(user.Id, "Admin");

        }   

     }   

   

//creating Creating Manager role    

        if (!roleManager.RoleExists("Manager"))   

        {   

           var role = new Microsoft.AspNet.Identity.EntityFramework.IdentityRole();   

           role.Name = "Manager";   

           roleManager.Create(role);     

        }   

   

//creating Creating Employee role    

        if (!roleManager.RoleExists("Employee"))   

        {   

             var role = new Microsoft.AspNet.Identity.EntityFramework.IdentityRole();   

             role.Name = "Employee";   

             roleManager.Create(role);   

   

        }   

} 

https://code.msdn.microsoft.com/ASPNET-MVC-5-Security-And-44cbdb97

https://stackoverflow.com/questions/35153541/add-claims-on-successful-login-and-retrieve-it-elsewhere-in-the-application

http://www.c-sharpcorner.com/UploadFile/56fb14/custom-authorization-in-mvc/

3.Write Custom AuthorizeAttribute

public class CustomAuthorizeAttribute : AuthorizeAttribute
{

    private readonly string[] allowedroles;

    public CustomAuthorizeAttribute(params string[] roles)

    {

       this.allowedroles = roles;

    }

    protected override bool AuthorizeCore(HttpContextBase httpContext)

    {

         bool authorize = false;

         var role =  (((ClaimsIdentity)httpContext.User.Identity).Claims.FirstOrDefault(x => x.Type == "http://schemas.microsoft.com/ws/2008/06/identity/claims/role")).Value;

          foreach (var roles in allowedroles)

          {

            if (roles == role)

            {

                authorize = true; /* return true if Entity has current user(active) with specific role */

            }

          }

          return authorize;

     }

    protected override void HandleUnauthorizedRequest(AuthorizationContext filterContext)

    {

       filterContext.Result = new HttpUnauthorizedResult();

    }
}

4. Pass string to date time without formatting

DateTime date = DateTime.ParseExact(this.Text, "dd/MM/yyyy", null);

5. Add log

private static void WriteLog_2(string error)

{

   try

   {

     StringBuilder sb = new StringBuilder();

     var LogName = "logsFormServices-" + DateTime.Now.ToString("yyyyMMdd") + ".txt";

     sb.Append(DateTime.Now.ToString("dd-MM-yyyy hh:mm:ss") + " | " + error + Environment.NewLine);

     File.AppendAllText("C:" + "\\" + LogName, sb.ToString());

     sb.Clear();

    }

    catch (Exception)

    {

    }

}

6.Call powershell script inside C# code

private bool CheckPrinterName(string Name)
{
  using (PowerShell PowerShellInstance = PowerShell.Create())
  {
     PowerShellInstance.AddScript("$U ='UserName';" +
     "$P = ConvertTo-SecureString 'Password' -AsPlainText -Force;" +
     "$mycreds = New-Object System.Management.Automation.PSCredential($U, $P);" +
     "Set-Item -Path WSMan:\\localhost\\Client\\TrustedHosts -Value '192.168.xx.xx' -Force;" +
     "Invoke-Command -ComputerName '" + TestContext.Properties["CVPServerIP"].ToString() +"' -ScriptBlock { Get-Printer } -credential $mycreds");

     Collection<PSObject> PSOutput = PowerShellInstance.Invoke();
     if (PowerShellInstance.Streams.Error.Count > 0)
     {
        return false;
     }
     var IsFound = false;
     foreach (PSObject outputItem in PSOutput)
     {
        if (outputItem != null)
        {
          if (outputItem.BaseObject.ToString().Contains(Name))
          {
             IsFound = true;
             break;
          }
        }
      }
      return IsFound;
   }
}


7.Multi Thread

class Program
{
  static void Main(string[] args)
  {
    Parallel.For(0, 10, (i) =>
    {
      Console.WriteLine("Parent Number****************** " + i);
      Run(i);
    });
  }

  private static void Run(int ID)
  {
    for (int i = 0; i < 10; i++)
    {
     Console.WriteLine("Parent ID:" + ID + "--> Child Number:" + i);
    }
  }
}



Sample out put















8.Call store procedure in C#

string ConnectionString = System.Configuration.ConfigurationManager.AppSettings["ConStr"];
using (SqlConnection con = new SqlConnection(ConnectionString))
{
  using (SqlCommand cmd = new SqlCommand("AddRecord", con))
  {
    cmd.CommandType = CommandType.StoredProcedure;
    cmd.Parameters.AddWithValue("@JobId", SqlDbType.NVarChar).Value = Guid.NewGuid().ToString();
    cmd.Parameters.AddWithValue("@Name", SqlDbType.NVarChar).Value = "12345";
    con.Open();
    cmd.ExecuteNonQuery();
    con.Close();
   }
}