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babloo123babloo123 

MIXED_DML_OPERATION, DML operation on setup object is not permitted after you have updated a non-setup object (or vice versa): User, original object: Contact: []: Trigger.Trigger12: line 17, column 1

I am getting a issue when I am trying to update by Email id on Contact which inturns updates the username on userobject and email on UserObject.Please can some one guide how to overcome this I need to change the ProfileID as well using the trigger.

trigger Trigger12 on Contact (before update) {
    
    System.debug(trigger.new[0].ID);
    
      Contact cnt=[select email from Contact where id=:trigger.new[0].Id];
    system.debug(cnt);
    String emailid=string.valueof(cnt.Email);
    system.debug('The Email id is:' + emailid);
    
    User usr=[select Email,Username from User where ContactId=:trigger.new[0].Id];
    system.debug(usr);
    
    if(trigger.new[0].Email!=cnt.Email)
    {
        usr.Email=trigger.new[0].Email;
    usr.username=trigger.new[0].Email; 
    }
    update usr;
    }
James LoghryJames Loghry
Try moving your logic to an after update rather than a before update Trigger.

Also, your trigger is not bulkified.  Meaning, if you load many contact records, only the first record is ever updated.

Please read this document for more information: https://developer.salesforce.com/page/Best_Practice%3A_Bulkify_Your_Code
babloo123babloo123
Hi James no before or after is not helping also we just have one contact so I did not bulkify. Can you help me other approach
Balaji BondarBalaji Bondar
Babloo,

you should create a new class and create a new method in that class
add @future keyword
Eg.
@future
public static void CreateUser(List<ID> UserID,Integer x,Map<ID,String> mapOfOldUserNames){

future method should be static I suppose. Now move all your logic to that future method. Now call this method from your trigger directly since this is a static method.

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babloo123babloo123
Balaji can you guide me how the code looks like stuck here from morning
Balaji BondarBalaji Bondar
Babloo,

Try below code : 
trigger Trigger12 on Contact (before update) {
	System.debug(trigger.new[0].ID);
	Contact cnt=[select email from Contact where id=:trigger.new[0].Id];
	system.debug(cnt);

	String emailid=string.valueof(cnt.Email);
	system.debug('The Email id is:' + emailid);

	User usr=[select Email,Username from User where ContactId=:trigger.new[0].Id];
	system.debug(usr);

	if(trigger.new[0].Email!=cnt.Email){
		usr.Email=trigger.new[0].Email;
		usr.username=trigger.new[0].Email; 
		UpdateUserInformation.UpdateUser(usr);
	}
	//update usr;
}
Async Apex class to update the trigger. 
public class UpdateUserInformation {
@future
	public static void UpdateUser(User userObj) {
		Update userObj;
	}
}
Important :
If this is what you were looking for then please mark it as a "SOLUTION" or You can Click on the "Like" Button if this was beneficial for you.