More Control Over Auto-Generated IDs in asp.net
In ASP.NET pages, using the same ID for two server controls isn't allowed. If this happens, the page won't compile -- period. In HTML, though, it is possible for two or more elements to share the same ID. In this case, when you make a search for an element via document.getElementById, you'll simply get an array of DOM elements. What about nested ASP.NET controls?
Most data-bound, template-based controls generate their output by repeating an HTML template for every data-bound item. This means that any child control defined with a unique ID in the template is being repeated multiple times. The original ID can't just be unique. For this reason, since the beginning, the ASP.NET team defined an algorithm to ensure that every HTML element emitted by an ASP.NET control could be given a unique ID. The ID resulted from the concatenation of the control ID with the ID of the naming container. Furthermore, in case of repeated controls (i.e., templates), a numeric index was added for disambiguation. For years, nobody really cared about the readability of the auto-generated ID, and strings like the following became fairly common:
ctl00$ContentPlaceHolder1$GridView11$TextBox1
What is the difference between String and StringBuilder?
Both String and StringBuilder are classes used to handle strings.
The most common operation with a string is concatenation. This activity has to be performed very efficiently. When we use the "String" object to concatenate two strings, the first string is combined to the other string by creating a new copy in the memory as a string object, and then the old string is deleted. This process is a little long. Hence we say "Strings are immutable".
When we make use of the "StringBuilder" object, the Append method is used. This means, an insertion is done on the existing string. Operation on StringBuilder object is faster than String operations, as the copy is done to the same location. Usage of StringBuilder is more efficient in case large amounts of string manipulations have to be performed.
