Format Exception and Drop down value

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Thanks its work.
But here i explain what i want.
i have 1 dropdownlist product.
1 text box take price.
1 search button.
if i don't give any product or price it will display all product.
and i call my search method in button click event.here my sample code

C#

int productid = int.Parse(DropDownListProduct.SelectedValue.ToString());
        
            int price;
            if (int.TryParse(txtPrice.Text, out price))
            {
                price = Convert.ToInt32(txtPrice.Text);
            }
            else
            {
                price =null or ""; give me ERROR
            }

ctlDropDown.Items.InsertAt(0, new ListItem("SELECT PRODUCT", null);
Give me Error if i don't select anything.and i put it under databind() form load event

Posted 9-Jun-12 6:37am

Member 8932104

Updated 9-Jun-12 14:08pm

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Stephen Hewison 11-Jun-12 3:06am

Then trying modifying the data collection before you bind it.

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Stephen Hewison · Accepted Answer · 2012-06-09T07:20:00

Hi,

int.TryParse wont throw an exception. It returns a boolean containing if the value was successfully parsed. It also takes an int as an output parameter so you still have access to the int value when successful. You can use it in the following way:

C#

int price = 0;
if(int.TryParse(txtPrice.Text, out price)) {
  // Do code here
}

In this example it doesn't throw an exception and only executes the relevant code when the input value is valid.

As for not selecting the first product in the list. Without seeing your code it's difficult to give advice. But my best guess would be that you need to add a place holder. Make the first item in the list "--Select--". Then in your code check for this value and ignore it if it's selected.