Setting a bit from a port

  #define LCD_PORT	LATC
  #define LCD_RS		0x04
......

LCD_PORTbits.LCD_RS = 1; // doesn't work

LCD_PORT.LCD_RS = 1; // doesn't work


LCD_PORTbits(.LCD_RS) = 1; // doesn't work

  #define LCD_RS		LATBbits.RB4

...
void main(void)
{ 
	LATB=0x00;
	ADCON1 = 0b01111111; // set as digital I/O 
...
}
void LCD_Cmd (unsigned char w){
	LCD_RS=0;  // I'm unable to compile this !!!!
}

volatile bit LCD_RS @ (unsigned)&LATC*8+4;

    LCD_RS=1;

void ADC_Init()
{
		ADCON2 = 0b10101110 ;//right justify, Frc/64 , 12Tad
		ADCON1=0b00000000 ;//ADC ref = Vdd,Vss boven- en onderste venster
		TRISBbits.TRISB4=1;//Set RB4 to analog (ANS10)  , compile ERROR 
		ADCON0 = 0b00101001 ;//AN10, ADC on
}		

void ADC_Go()
{
	ADCON0bits.GO=1 ;//Start conversion , compile ERROR 
//ADCPoll:
	while(ADCON0bits.DONE==1); //Is conversion done? , compile ERROR 
	//	; Result is complete - store 2 MSbits in ADCH 
		ADCH = ADRESH;
		ADCL= ADRESL;
}

     LCD_PORT=w;
     LCD_RS=0;//RS line to 0
     TRISBbits.TRISB4=1;

void ADC_Go()
{
	ADCON0.GO=1 ;//Start conversion // compile error
//ADCPoll:
	while(ADCON0.DONE==1); //Is conversion done? // compile error