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    Every once in awhile, you come across this exception: System.

    Null Reference Exception – “Object reference not set to an instance of an object.” You see people asking about this everywhere; about why are they getting this error. Note, regardless of the scenario, the cause is always the same in .

    Update panel is probably one of the first thing that you will use once you get your Ajax toolkit with the Framework.

    Array List is a dynamic array; it will increase the size of the storage location as required. The allocation of the Array List can be done through the Trim To Size property.

    Empty, or to some other actual value, before it will compile in C#, or run without exception in VB. Net, set [a = “something”] before you attempt to do anything with it. Strings and some other CTS types have a misconception of being value types, like Integers, and they are not.

    A more complex example would be that you disposed of a class that maybe you use to access the database. But then, somewhere else, you tried to call a method of that class that used those objects that no longer exists.

    String Builder and String class String A string is a sequential collection of Unicode characters that represent text. Concat method concatenates one or more instances of a String. Write Line (string1); string string2 = "Hi " "This is Jitendra ";string2 = "Sampathi Rao."; Console. Every time you use one of the methods in the System. String Builder class can be used when you want to modify a string without creating a new object. While coding, we look for classes that can reduce manual operation.

    String is a class that belongs to the namespace System. String concatenation can be done using the ' ' opearator or the String. Sample code string string1 = "Today is " Date Time. Write Line(string2); String Builder String Builder is a class that belongs to the namespace System. String class, you create a new string object in memory, that requires a new allocation of space for that new object. For example, using the String Builder class can boost performance when concatenating many strings together in a loop. What is the difference between array and array list? For instance if you want to sort the values in an array then you need to do the manual operations.

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