Hi
As a newbie I'm trying to learn to use methods... and I'm a bit stuck 
. This is what I'm trying to achieve [I'm expanding an exercise from the internet]:
1. select one of 3 countries from a comboBox [cboCountry] - show selected country in cboCountry
2. enter amount of cash to do calculation on [txtAmount]
3. depending on which country is selected will depend on the FxRate - which will show in the textBox txtFxRate
4. txtSubTotal (taxableAmount) should show figure entered in txtAmount * figure entered in txtFxRate [as passed by the cboCountry]
5. txtCashierFee should show 2% on the subTotal [cashierFee of 2% on the taxableAmount]
6. txtGrandTotal then shows subTotal + cashierFee
These are the two errors I get:
C:\BEGIN2\code\Lesson4x\ForEx\Form1.cs(265): 'displayResult' denotes a 'variable' where a 'method' was expected
C:\BEGIN2\code\Lesson4x\ForEx\Form1.cs(236): The name 'fxRate' does not exist in the class or namespace 'ForEx.Form1'
Many thanks for your help in advance 
My code:
private void btnDollar_Click(object sender, System.EventArgs e)
{
#region
select switch(cboCountry.Text){
case "USA":{
fxRate = 1.74743;
break;}
case "PHIL":{
fxRate = 89.4507;
break;}
case "SAU":{
fxRate = 6.55381;
break;}
}
#endregion
double fxRate; double taxableAmount; //subtotal double cashierFee; // 2% double grandTotal; double displayResult;txtFxRate.Text = cboCountry.Text.ToString();
txtTaxableAmount.Text = taxableAmount.ToString();
taxableAmount = calculateTaxableAmount(taxableAmount, fxRate);
cashierFee = calculateCashierFee(taxableAmount);
grandTotal = calculateGrandTotal(taxableAmount, cashierFee);
displayResult = displayResult(grandTotal);
}
#region
private methods private double calculateTaxableAmount(double taxableAmount, double fxRate){
return taxableAmount * fxRate;}
private double calculateCashierFee(double taxableAmount){
return taxableAmount * 0.02;}
private double calculateGrandTotal( double taxableAmount, double cashierFee){
return taxableAmount + cashierFee;}
private void displayResult(double grandTotal){
MessageBox.Show("grand total = " + String.Format("0.C)", grandTotal));
}
#endregion
mileswoolgarPosted Mar 27, 2006, 5:01 AM
I changed this: displayResult = displayResult(grandTotal); to this: showResult = displayResult(grandTotal);
I now get a conversion error on this line of code - Cannot implicitly convert type 'void' to 'double'
To solve this I tried - showResult = displayResult(grandTotal.ToString());
...But then I got an overload error -
The best overloaded method match for 'ForEx.Form1.displayResult(double)' has some invalid arguments
Any suggestions... anybody?
Many Thanks.
My code now looks like this>>
private void btnDollar_Click(object sender, System.EventArgs e)
{
#region
select double fxRate; switch(cboCountry.Text){
case "USA":{
fxRate = 1.74743;
break;}
case "PHIL":{
fxRate = 89.4507;
break;}
case "SAU":{
fxRate = 6.55381;
break;}
}
#endregion
double taxableAmount;double cashierFee; double grandTotal; double showResult;
txtFxRate.Text = cboCountry.Text.ToString();
txtTaxableAmount.Text = taxableAmount.ToString();
taxableAmount = calculateTaxableAmount(taxableAmount, fxRate);
cashierFee = calculateCashierFee(taxableAmount);
grandTotal = calculateGrandTotal(taxableAmount, cashierFee);
// showResult = displayResult(grandTotal.ToString());
showResult = displayResult(grandTotal);}
#region
private methods private double calculateTaxableAmount(double taxableAmount, double fxRate){
return taxableAmount * fxRate;}
private double calculateCashierFee(double taxableAmount){
return taxableAmount * 0.02;}
private double calculateGrandTotal( double taxableAmount, double cashierFee){
return taxableAmount + cashierFee;}
private void displayResult(double grandTotal){
MessageBox.Show("grand total = " + String.Format("0.C)", grandTotal));
}
#endregion
Ahmad ShabanPosted Mar 26, 2006, 4:15 AM
Hi
your problem seem to be
C:\BEGIN2\code\Lesson4x\ForEx\Form1.cs(236): The name 'fxRate' does not exist in the class or namespace 'ForEx.Form1'
why ?? cause you must declare the variable before using it !!
------------------------------------------
switch(cboCountry.Text)
{
case "USA":
{
fxRate = 1.74743;
break;
}
case "PHIL":
{
fxRate = 89.4507;
break;
}
case "SAU":
{
fxRate = 6.55381;
break;
}
}
#endregion
double fxRate; //<------ must go before the switch you should movedouble fxRate;
before the switch
C:\BEGIN2\code\Lesson4x\ForEx\Form1.cs(265): 'displayResult' denotes a 'variable' where a 'method' was expected
---------------------------------
double displayResult;
txtFxRate.Text = cboCountry.Text.ToString();
txtTaxableAmount.Text = taxableAmount.ToString();
taxableAmount = calculateTaxableAmount(taxableAmount, fxRate);
cashierFee = calculateCashierFee(taxableAmount);
grandTotal = calculateGrandTotal(taxableAmount, cashierFee);
displayResult = displayResult(grandTotal);
------------private void displayResult(double grandTotal)
{
MessageBox.Show("grand total = " + String.Format("0.C)", grandTotal));
}
YOU CAN'T HAVE SAME NAME IN ONE SCOPE
HERE YOU HAVE
double displayResult; // THIS IS VARIABLE
and a method has the same name which is not accepted change the name of the var or the method