getting operator error c#

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C#

List<textbox> list = new List<textbox>();

            //...
            list.Add(Price1);
            list.Add(Price2);
            list.Add(Price3);
            list.Add(Price4);
            list.Add(Price5);
            list.Add(Description1);
            list.Add(Description2);
            list.Add(Description3);
            list.Add(Description4);
            list.Add(Description5);
            list.Add(Quantity1);
            list.Add(Quantity2);
            list.Add(Quantity3);
            list.Add(Quantity4);
            list.Add(Quantity5);
            //...


            foreach (TextBox txt in list)
            {
                if (String.IsNullOrWhiteSpace(Description1.Text) == true)
                {
                    MessageBox.Show("Please provide a full set of inputs: Product description, product price,and product quantity.");
                }
                else
                {
                    Totalprice = Price1 + Price2 + Price3 + Price4 + Price5;
                    Totalquantity = Quantity1 + Quantity2 + Quantity3 + Quantity4 + Quantity5;
                    Grandtotal = Totalprice * Totalquantity;
                    Grandtotal.Text = Grandtotal.ToString();

getting:

Error	4	Operator '+' cannot be applied to operands of type 'System.Windows.Forms.TextBox' and 'System.Windows.Forms.TextBox'

Posted 29-Sep-15 19:33pm

Member 12021613

Updated 29-Sep-15 20:12pm

Maciej Los

v2

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Comments

VR Karthikeyan 30-Sep-15 1:56am

Hi,

This error thrown because, we can't perform this addition between two object instances. To answer your question, just clarify the following,

list.Add(Price1);
list.Add(Price2);
list.Add(Price3);
list.Add(Price4);
list.Add(Price5);
list.Add(Description1);
list.Add(Description2);
list.Add(Description3);
list.Add(Description4);
list.Add(Description5);
list.Add(Quantity1);
list.Add(Quantity2);
list.Add(Quantity3);
list.Add(Quantity4);
list.Add(Quantity5);

In the above code, tell me the type of "list". And also clarify about the types of
Price1
Price2
Price3...

VR Karthikeyan 30-Sep-15 1:58am

I think,
[ Price1...Price5, ]
[ Description1...Description5, ]
[ Quantity1...Quantity5 ]
these are textboxes, am i right?

2 solutions

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VR Karthikeyan · Answer 1 · 2015-09-29T20:09:00

Use the following code, Use a flag to check empty textboxes,

C#

bool IsAnyTextBoxEmpty =  false;
foreach (TextBox txt in list)
{
  if (String.IsNullOrWhiteSpace(txt.Text.Trim()) == true)
  {
     MessageBox.Show("Please provide a full set of inputs: Product description,  product price,and product quantity.");
     IsAnyTextBoxEmpty = true;
     txt.Focus();//to set cursor in empty textbox
  }
}

if(IsAnyTextBoxEmpty == true)
{
   double Totalprice = Convert.ToDouble(Price1.Text.Trim()) +
                       Convert.ToDouble(Price2.Text.Trim()) +
                       Convert.ToDouble(Price3.Text.Trim()) +
                       Convert.ToDouble(Price4.Text.Trim()) +
                       Convert.ToDouble(Price5.Text.Trim());
   double Totalquantity = Convert.ToDouble(Quantity1.Text.Trim()) +
                          Convert.ToDouble(Quantity2.Text.Trim()) +
                          Convert.ToDouble(Quantity3.Text.Trim()) +
                          Convert.ToDouble(Quantity4.Text.Trim()) +
                          Convert.ToDouble(Quantity5.Text.Trim());
   double Grandtotal = Totalprice * Totalquantity;
   Grandtotal.Text = Grandtotal.ToString();
}

Member 10517264 · Answer 2 · 2015-09-29T19:49:00

Solution 1

Hey,
You can not apply operator(+) on TextBox directly.You need to use TextBox.Text property.
Thanks,
Sujay

Posted 29-Sep-15 19:49pm

Member 10517264