void EmployeeSearch()
{
vector<string> file;
string temp;

ifstream infile("GROUP.txt");

while( !infile.eof() )
{
	getline(infile, temp);
	file.push_back(temp);
}
// done reading file
infile.close();

string item;

cout << "Enter an employee number to delete from the file: ";
getline(cin, item);

for(int i = 0; i < (int)file.size(); ++i)
{
	if(file[i].substr(0, item.length()) == item)
	{
					
		file.erase(file.begin() + i);
		cout << "Order erased!"<< endl;
		i = 0; // Reset search
	}
}

This code works fine and deletes the appropriate record when ran in its own program. However, when i implement this as a method within my class, it does not work and deletes every record in the file. Any help would be greatly appreciated.

/////////////////////////////
//////CLASS EMPLOYEE///////////////
class Employee
{
      private:
      string EmployeeID, EmployeeFirstName, EmployeeLastName,;
      double Wage;
      
      public:
      
//////////////////////////////////////////
//////CLASS FUNCTION AddEmployee//////////      
void AddEmployee()   
    {  
           
    char choice;
    cout  <<"Enter Employee ID: ";
    cin >> EmployeeID;

      cout << "\n";
     cout<<"Enter Employee First Name: ";
     cin >> EmployeeFirstName;
     cout << "\n";
     cout<<"Enter Employee Last Name: ";
     cin >> EmployeeLastName;
     cout << "\n";
     cout<< "Enter Employee Wage: ";
     cin >> Wage;  
     cout << "\n\n";  
     cout << "ID Number:  " << EmployeeID << "  F.Name:  " << EmployeeFirstName << "  L.Name:  " << EmployeeLastName << "  Wage: " << Wage << "\n\n";

     cout << "Would you like to write this record to file? y/n?";
     cin >> choice;
     
     
     fstream file;
     file.open("GROUP.txt", ios::app | ios::out);

     
   if (choice != 'n')
   {
   
      if (file.is_open())
      {
      file << EmployeeID << "," << EmployeeFirstName << "," << EmployeeLastName << "," << Wage << ",\n\n";
      cout << "Wrote to the file";
      }
   else
   {
       cout << "Record not saved";
   }
   
}  
     else
     {
     cout << "Error reading the file";
     }
 
     file.close();
         
         }


 
//////////////////////////////////////////
//////CLASS FUNCTION Employeedelete//////////
void EmployeeSearch()
{
vector<string> file;
string temp;

ifstream infile("GROUP.txt");

while( !infile.eof() )
{
	getline(infile, temp);
	file.push_back(temp);
}
// done reading file
infile.close();

string item;

cout << "Enter an employee number to delete from the file: ";
getline(cin, item);

for(int i = 0; i < (int)file.size(); ++i)
{
	if(file[i].substr(0, item.length()) == item)
	{
					
		file.erase(file.begin() + i);
		cout << "Order erased!"<< endl;
		i = 0; // Reset search
	}
}

//write new order list back out
ofstream out("GROUP.txt", ios::out | ios::trunc);

for(vector<string>::const_iterator i = file.begin(); i != file.end(); ++i)
{
	out << *i << endl;
}
out.close();
}

//////////////////////////////////////////
//////CLASS FUNCTION EmployeeEDIT//////////
void EmployeeEdit()
{
    ifstream data("GROUP.txt");
    string item,line;
    int x=0;
    int y=0;
    string id;

    cout<<endl;
    cout<<"Enter Employee Id: ";
    cin>>id;
    cout<<""<<endl;

    while(!data.eof())
    {
        double wage; 
        
        char Choice; //declare char choice
        getline(data,line); //get each line and store it in data
        string item_array[10], NewWage; //declare strings item_array and NewWage
        stringstream stream(line);
        x=0,y=0;

        while(getline(stream,item,','))
        {
            item_array[x]=item;
            x++;
            item_array[y]=item;
            y++;
            

        }

        if(item_array[0]==id)
        {
            cout<<setfill('-')<<left<<setw(10)<<"\t\t\tID:   " <<right<<"  "<<item_array[0]<<endl;
            cout<<setfill('-')<<left<<setw(10)<<"\t\t\tFirst Name: " <<right<<" "<<item_array[1]<<endl;
            cout<<setfill('-')<<left<<setw(10)<<"\t\t\tLast Name: " <<right<<" "<<item_array[2]<<endl;
            cout<<setfill('-')<<left<<setw(10)<<"\t\t\tWage: " <<right<<" "<<item_array[3]<<endl;
            cout<<setfill('-')<<left<<setw(10)<<"\t\t\tWage: " <<right<<" "<<item_array[4]<<endl;

            
            
            cout << "Would you like to change the Wage? Y/N ";
            cin >> Choice;    
            
            if (Choice == 'y')
            {
            cout << "What would you like to change the wage too?";
            cin >> NewWage;
            
            cout<<setfill('-')<<left<<setw(10)<<"\t\t\tCurrent Wage: " <<right<<" "<<item_array[3]<<endl;
            
            item_array[3] = NewWage;
            cout<<setfill('-')<<left<<setw(10)<<"\t\t\tCurrent Wage: " <<right<<" "<<item_array[3]<<endl;
            }
        }
    }
    data.close();
}


//////////////////////////////////////////
//////CLASS FUNCTION DisplayAllEmployees//////////
               
void DisplayAllEmployees()
{
    string line;
    ifstream x ("GROUP.txt");

    if (x.is_open())
    {
    while(!x.eof())
    {

    cout<<endl;
    getline(x,line);
    cout<<line<<endl;

    }
    x.close();
    }
    else
    cout<<"Cant open file."<<endl;
}


};

This is my code for the class. Please ignore the employee edit bit. I've not got this working yet.
Many thanks