Question

I have the following code –

int lat = System.Convert.ToInt16(latTextBox1.Text);

This is happening on a changed event.

However my code is breaking on this line saying –

Input string was not in a correct format.

Where latTextBox1.Text = "" which is an empty string.
I think this is breaking because it cannot convert an empty string into a null value.

How can I modify my code to account for null values?

Answer 1

OK, based on your comment you could use:

int? lat = string.IsNullOrEmpty(latTextBox1.Text) 
               ? (int?)null : Convert.ToInt32(latTextBox1.Text);

int? is a nullable int.