STRINGS (SUBSTRING) IN C#

Today in Engineer's World, we are discussing a very important topic of C# -String in very easy way. Posted By- +Manish Kumar Gautam +LIV WIRE +ASP.NET SOLUTIONS

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To read STRINGS (SUBSTRING) IN C# Part 2 - Click here.

3. ToLower()

ToLower() method is used to convert the specified character or string to lowercase from the given string. Its return type is string.

Example- Suppose we have a string that has four fields name, education, mobile and email and we need to lowercase the string?

Practical Implementation:

using System;

namespace AspnetSolutions
{
    class Substring
    {
        public static void Main() 

        {
            string str = "Name=Tapan,Education=BCA,Mb=xxxxxxx,Email=Tap@tap.com";

            Console.WriteLine("ToLower()");
            //Using ToLower()
            Console.WriteLine("Using String: " + str.ToLower());
          Console.WriteLine("Using Substring: " + str.Substring(str.LastIndexOf("T")).ToLower());

        }
    }
}

Output

FIGURE 1

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In the output window, we have two different outcomes. Let's understand each one of them.

a) Using String- First one lowercase the given string. 

b) Using Substring- Second one shows how we can get a sub part of the given string using substring() method and display them in lowercase. For ex- fetching out 'Tap@tap.com' and lowering its case to make it 'tap@tap.com'.

4. ToUpper()

ToUpper() method is used to convert the specified character or string to uppercase from the given string. Its return type is string.

Example- Suppose we have a string that has four fields name, education, mobile and email and we need to uppercase the string?

Practical Implementation:

using System;

namespace AspnetSolutions
{
    class Substring
    {
        public static void Main() 

         {
            string str = "Name=Tapan,Education=BCA,Mb=xxxxxxx,Email=Tap@tap.com";

            Console.WriteLine("ToUpper()");
            //Using ToUpper()
            Console.WriteLine("Using String: " + str.ToUpper());
          Console.WriteLine("Using Substring: " + str.Substring(str.LastIndexOf("T")).ToUpper());

        }
    }
}

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Output

FIGURE 2

In the output window, we have two different outcomes. Let's understand each one of them.

a) Using String- First one uppercase the given string. 

b) Using Substring- Second one shows how we can get a sub part of the given string using substring() method and display them in uppercase. For ex- fetching out 'Tap@tap.com' and upper casing its character to make it 'TAP@TAP.COM'.

To read STRINGS (SUBSTRING) IN C# Part 4 - Click here.

Related Questions: 

#newtoprgm try firstprogram

Q-1 What will be the code to get the output? 

Ans- There are many ways to get the output. But one possible solution based on what we have studied in strings till now is mentioned below:

using System;

namespace AspnetSolutions

{
    class Substring
    {
        public static void Main()  

        {

            string emailAddress = "ImagiNaTiOnHuNT.BlogSpOT@asd.in";
            Console.WriteLine("Email Address = " + emailAddress);

            string holdername = emailAddress.Substring(0, emailAddress.LastIndexOf("T") + 1);
            string domainpart = emailAddress.Substring(emailAddress.IndexOf("@") + 1);
            Console.WriteLine("HolderName = {0} \nDomainPart = {1}", holdername.ToUpper(), domainpart.ToLower());

        }
    }
}

Q-2 Suppose we are not using the System Namespace then which of them will result in error?

//using System;                ------------------->Commenting out System namespace
namespace AspnetSolutions

{
    class Substring
    {
        public static void Main()  

        {

            string Abc ;
            String Xyz ;
        }
    }
}

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A) Both having error, string Abc and String Xyz.

B) Both run perfectly, string Abc and String Xyz.

C) Only string Abc

D) Only String Xyz

Ans- Option (D).

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