How to convert empty string in int32?

You may utilizeint.TryParse in place ofConvert.ToInt32

int myInt;
if(!int.TryParse(team.SelectSingleNode(".//td[@class='number total won total_won']")?.InnerText.Trim(), out myInt))
{
  myInt = 0;
}

I know, but I've 30+ lines of code, so I should add a lot of if conditions... – Ilnumerouno just now

Instead, you may create a helper method.

public static class Converter{
    public static int ConvertToInt(string stringAsInt){
      int myInt;
      return int.TryParse(stringAsInt, out myInt) ? myInt : 0;
    }
}

executing code.

var parsedInt = Converter.ConvertToInt(team.SelectSingleNode(".//td[@class='number total won total_won']")?.InnerText.Trim());