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Saturday, March 8, 2014

Array and ArrayList in C#.Net

In this post we will discuss about array and arraylist in C#.net.

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Array:
- Arrays allow you to store a series of values that have the same data type.

- The values can be accessed by using its index number. And the index starts with 0 and the highest index is one less than the number of elements.

- Below is a string array:
string[] stringArray = new string[5];
Here new keyword is used to initialize the array.

Also you can directly put the values like below:
string[] stringArray = {"1", "2", "3", "4","5"};

- We can access the values like below:

string value = stringArray[3];
The value will be 4;

- If you create an array, you can not resize the array.

- If you declared a interger array then only interger can be stored, if you try to initialize any other thing then it will give exception.

- Similarly you can create multidimentional array like below:

int[,] intArray = {{1, 2}, {3, 4}, {5, 6}, {7, 8},{9,10}};

ArrayList:
- ArratList supports any type of object and always allows dynamic resizing, means the size can be increased or decreased.

- Syntax to create array:
ArrayList arr = new ArrayList();

Put the value like below:
arr.Add("Value1");
arr.Add("Value2");
arr.Add("Value3");

And we can retrieve the value like below:
string value = Convert.ToString(arr[1]);


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