Uppercase and Lowercase Strings in C#

Introduction

The String.ToUpper() and String.ToLower() methods in C# and .NET convert a string into an uppercase and a lowercase string respectively. These methods are easy to use.

The following code sample converts strings into uppercase and lowercase strings. 

string author = "Mahesh Chand";  
string bio = "Mahesh Chand is a founder of C# Corner.";  
  
// Covert everything to uppercase  
string ucaseAuthor = author.ToUpper();          
Console.WriteLine($"Uppercase: {ucaseAuthor}");  
  
// Covert everything to lowercase  
string lcaseAuthor = author.ToLower();  
Console.WriteLine($"Lowercase: {lcaseAuthor}");  
  
// We can direct convert to uppercase or lowercase  
Console.WriteLine(bio.ToLower());  
Console.WriteLine(bio.ToUpper());  

The output from the above code is shown below.

Convert the first letter of a string to uppercase

The following code snippet makes a string's first letter uppercase.  

// convert first letter of a string uppercase  
string name = "chris love";  
if (!string.IsNullOrEmpty(name))  
{  
    name = char.ToUpper(name[0]) + name.Substring(1);  
}  
Console.WriteLine($"String with first letter uppercase: {name} ");  

Convert a part of a string to lowercase

The following code snippet converts a part of a string to lowercase.  

// Convert a part of string to lowercase  
string uName = "MAHESH CHAND";  
string updatedName = uName.Substring(0, 1).ToUpper() + uName.Substring(1).ToLower();  
Console.WriteLine(updatedName);  

Make every first character of each word in a string uppercase

TextInfo.ToTitleCase method can be used to make every word in a string starts with an uppercase character.  

// Every word start with uppercase  
string aName = "mahesh chand beniwal";  
string fullName = CultureInfo.CurrentCulture.TextInfo.ToTitleCase(aName);  
Console.WriteLine(fullName);  

Conclusion

To learn more about C# strings, check out the String In C# tutorial to learn more about strings and how to work with strings in C#.