Declare String in c#

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// Declare without initializing.

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string message1;
// Initialize to null.

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string message2 = null// Initialize as an empty string.

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// Use the Empty constant instead of the literal "".

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string message3 = System.String.Empty;

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// Use System.String if you prefer.

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System.String greeting = "Hello World!";

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// Use a const string to prevent 'message4' from

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// being used to store another string value.

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const string message4 = "You can't get rid of me!";

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// Use the String constructor only when creating

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// a string from a char*, char[], or sbyte*.

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// System.String documentation for details.

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char[] letters = { 'A', 'B', 'C' };

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string alphabet = new string(letters);