How to break a decimal value into integral and decimal part?

Question

I'm currently working on a hotel management system's invoice (asp.net  c#)... My question is that how to show the round off on a label example  if the total amount is 8023.25 round off label should show .25 and  totallabel should show 8023...  Please can anybody help me with this {with code} ???
}

Actually i've tried the following code:

public void texboxtolabel() 
{ 
decimal amt; 
bool isAValid = decimal.TryParse(total.Text, out amt); 
decimal value = (decimal)amt; 
if (isAValid)          
popopop.Text = (amt - value).ToString();            
durration();         
amountintax();         
amountinwords();         
nameeee.Text = cname.Text;         
companynamee.Text = companyy.Text;         
gstinnnnn.Text = gstin.Text;         
phoneeee.Text = mobile.Text;         
addressss.Text = address.Text;         
boooookingid.Text = bookingno.Text;         
rooomnoo.Text = roomnumber.Text;         
nooffpersoon.Text = noofperson.Text;         
checkinnn.Text = from.Text;         
checkoutttt.Text = to.Text;         
tariff.Text = TextBox1.Text;         
amount.Text = price.Text;         
cgstamoount.Text = taxonpricehalf.Text;         
sgstamoount.Text = taxonpricehalf.Text;         
taxxxter.Text = taxwithdiscount.Text;         
roundoff.Text = popopop.Text;         
billamount.Text = value.ToString(); 

but it is not working

 

Any body can help me please...!