error while getting the hiddenValue from the combobox corresponding to the displayed value

Question

This is a code I found from this link Hidden Id With ComboBox Items?.

class ComboBoxItem
{

       string displayValue;
       public string hiddenValue;

       //Constructor
       public ComboBoxItem (string d, string h)
       {
            displayValue = d;
            hiddenValue = h;
       }


       //Accessor
       public string HiddenValue
       {
           get
           {
               return hiddenValue;
           }
       }

       //Override ToString method
       public override string ToString()
       {
            return displayValue;
       }

}

Using the below code

ComboBox.Items.Add(new ComboBoxItem("DisplayValue", "HiddenValue");

I was able to display the value that I expected to display. Lets say for example, I saved ComboBox.Items.Add(new ComboBoxItem("Mike", "1");. It displays Mike in the combobox without a problem. But now what I need, is to take the corresponding hiddenvalue from the combobox.

For that, I ran the below code.

string hValue = ((ComboBoxItem)ComboBox.SelectedItem).HiddenValue;

But in the runtime, its throwing me an NullReferenceException. “Object reference not set to an instance of an object.”

But is it actually selected in the ComboBox? Have you physically selected it before running this code? — Simon Whitehead, Nov 09 '12 at 03:26
Almost all cases of NullReferenceException are the same. Please see "[What is a NullReferenceException in .NET?](http://stackoverflow.com/questions/4660142/what-is-a-nullreferenceexception-in-net)" for some hints. — John Saunders, Nov 09 '12 at 03:29
Set a breakpoint and check what is null. Where is this code being called from? — Simon Whitehead, Nov 09 '12 at 03:33
@SimonWhitehead Thanks sir. It was a dumb mistake! as you said it was not selected. — don, Nov 09 '12 at 03:34

error while getting the hiddenValue from the combobox corresponding to the displayed value

0 Answers0