VMware vCenter login Through PowerCLI

#How to connect to VMware vCenter Through PowerCLI 

clear
Add-PSSnapin VMware.VimAutomation.Core

#above line is mandatory to add so that it can import all the function of VMware automation module 

#first you need to create login so that every time you do not need to put your username and password 

write-host "1.Create Login `n2. Connect vCenter China `n3. Connect vCenter Japan `n4. Connect Both vCenter`n"
$ch=read-host "Enter your choice [1,2,3,4] :"
#$ch is a variable which will store your choice

#This loop will run only if you wanted to created login
#Before doing this make sure to create a folder named "vccred" in your system drive 

if($ch -eq 1)
{
$Admin = Read-Host "Enter username to connect to vCenter [domianusername]"
$sysdrv=$env:SystemDrive #$sysdrv refering to system drive "c:" most of the cases
  $SecureString = Read-Host -AsSecureString 'Enter password'
  ConvertFrom-SecureString $SecureString > $sysdrv/vccred/login.txt
  echo "Credential created in the system drive"
}

######## Once you created the login below code will be used to get the credential and login to vCenter
$Admin = "vayu.cominsane" #here vayu.com is teh domain name and insane is the username
$Password = Get-Content C:vccredlogin.txt | convertto-securestring
$Credential = new-object -typename System.Management.Automation.PSCredential -argumentlist $Admin, $Password
########

if($ch -eq 2)
{
Connect-VIServer 192.168.1.100 -SaveCredentials -Credential $Credential
}

if($ch -eq 3)
{
Connect-VIServer 192.168.2.100 -SaveCredentials -Credential $Credential
}

if($ch -eq 4)
{
Connect-VIServer 192.168.1.100 -SaveCredentials -Credential $Credential
Connect-VIServer 192.168.2.100 -SaveCredentials -Credential $Credential

}