Logical Operators in C#.Net

In this asp.net c# post we will learn logical operators with example.

Logical Operators in C#.Net

The C# language supports basic three logical operators.The logical operators retursns true or false as output.
The logical operators are used when we have conditional statement such as if statement.

C# Supports following logical operators

Assume variable X is true and variable Y is false then

Logical Operator &&

Logical operator && pronounced as AND operator. It returns true if both or all conditions are true and returns false is one of condition is false.

Assume int variable X=10 and variable Y=5 then

if ( X=10 && Y=4)
{
Result = “True”;
}
else
{
Result = “False”;
}

Here, output is Result = “False” because the second condition Y=4 is false.

Logical && operator example in visual studio with c# language.

Design web form like below screen along with two textbox, a button control and a label control. Textbox for username and password and label control for display result.

Here, we assume username=”meera” and password=”123″ when we try to login with same username and password we assumed then return message like welcome to system other wise return error message like invalid credential.

Here, we use && operator in if condition for check both username and password are right or wrong. Above c# .net example first we input username=meera and password=123 then result is Welcome to System and when we try  username=meera and password=234 that time result will be Invalid Credential because password value is wrong as we assume.

C# code for above example :

Logical Operator ||

The logical || operator pronounced as OR operator in c#.

As we learn above if we use && operator then both condition must be true but in || or operator one of single condition is true from all, it will display “Welcome to System” message.

C# code for above example

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class Opertorss : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    protected void btnlogin_Click(object sender, EventArgs e)
    {
        if (txtuname.Text == "meera" || txtupass.Text == "123")
        {
            lblmsg.Text = "Welcome to System";
        }
        else
        {
            lblmsg.Text = "Invalid Credential";
        }
    }
}

Logical Operator !

The logical operator ! pronounced as NOT operator in c#.

If the condition is true then logical not operator returns false.

Assume int variable X=10 and variable Y=5 then

if (X != Y)
{
result = “X is not equal to Y”;
}
else
{
result = “X is equal to Y”;
}

Here, output is result = “X is not equal to Y” because value of X and Y not same so return true block.

We hope that this asp.net tutorial helped you to understand about Logical Operators in C#.

Next asp.net tutorial we will learn about Relational Operators.