int.Parse, Input string was not in a correct format

How would I parse an empty string? int.Parse(Textbox1.text) gives me an error:

Input string was not in a correct format.
System.FormatException: Input string was not in a correct format.

If the text is empty (Textbox1.text = ''), it throws this error. I understand this error but not sure how to correct this.

If you're looking to default to 0 on an empty textbox (and throw an exception on poorly formatted input):

int i = string.IsNullOrEmpty(Textbox1.Text) ? 0 : int.Parse(Textbox1.Text);

If you're looking to default to 0 with any poorly formatted input:

int i;
if (!int.TryParse(Textbox1.Text, out i)) i = 0;

Well, what do you want the result to be? If you just want to validate input, use int.TryParse instead:

int result;

if (int.TryParse(Textbox1.Text, out result)) {
    // Valid input, do something with it.
} else {
    // Not a number, do something else with it.
}

if(!String.IsNullOrEmpty(Textbox1.text))
    var number = int.Parse(Textbox1.text);

Or even better:

int number;

int.TryParse(Textbox1.Text, out number);

Try this:

int number;
if (int.TryParse(TextBox1.Text, out number))
{
    //Some action if input string is correct
}

If the input is a number or an empty string this will work. It will return zero if the string is empty or else it will return the actual number.

int.Parse("0"+Textbox1.Text)

int.Parse, Input string was not in a correct format

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