Question

I was wondering if there is a command in C# which I can use like with command in Delphi?

// like this :
with(textbox1)
{
   .text="some text as text of text box";
   .tag=1231;
}

// in Delphi

with edit1 do 
 begin
   text="some text as text of edit1";
   tag=1231;
 end;

Answer 1

Not for already created instances.

However, when you create a new instance you can do:

var textbox1 = 
   new Textbox
   {
       Text = "some text as text of text box",
       Tag = 1231
   };