Map contains key is case sensitive

 Here is my previous post related to map contains method. 

How contains key method works ? Does it allow partial matches or exact matches ?

We know map contains key method is case sensitive. if you are create a key using First Name , Last Name and DOB to find unique Account record then system will consider 2 different record for below scenario.

1. First Name - "Capital"  Last Name- "Testing" DOB- 01/01/1989

2. First Name - "CAPITAL" Last Name - "TESTING" DOB- 01/01/1989

The work wound is 

map<String,Account> map_Name_Acc = new map<String,Account>();

String sKey = '';

for(Account acc:[SELECT firstname,Lastname,DOB__c from Account limit 10]{

    sKey = acc.FirstName+'_'+ acc.LastName+'_'+acc.DOB__c; // this will create duplicate records since key is case sensitive

 sKey = acc.FirstName.toLowercase()+'_'+ acc.LastName.toLowercase()+'_'+acc.DOB__c; 

}

toLowercase() - convert name to lower case, "CAPITAL" and "Capital" will be "capital"