63 lines
864 B
Markdown
63 lines
864 B
Markdown
# String method
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## ToUpper
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set strings uppercase
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```C#
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String fullName = "mrsh";
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fullName = fullName.ToUpper();
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```
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## Tolower
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set strings lowercase
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```C#
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String fullName = "mrsh";
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fullName = fullName.ToLower();
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```
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## Replace
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```C#
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String phoneNumber = "123-456-789";
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phoneNumber.Replace("-", "/");
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```
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## Insert
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```C#
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String fullName = "mrsh online";
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userName = fullName.Insert(0, "@");
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```
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## Length
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```C#
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String fullName = "mrsh online";
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fullName.Length();
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```
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## Substring
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```C#
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String fullName = "mrsh online";
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String firstName = fullName.Substring(0,4);
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String lastName = fullName.Substring(5,6);
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```
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## String interpolation
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```C#
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String firstName = "mrsh";
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String lastName = "Online";
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int age = 21;
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Console.WriteLine($"Hello {firstName} {lastName}.");
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// include 10 spaces
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Console.WriteLine($"You are {age, 10} years old.");
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```
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