SOLVED Empty txtbx error "input string was not in a correct format"

Simply do this by validation null or empty

 Regards

Rijwan 

you are assigning int or decimal to string , means TextBox.Text is always string but somewhere in code or when you clear the textbox you are assigning TextBox.Text= Convert.ToInt32(somevale); which is incorrect.

 

or second case by mistake your textboxes are taking space but in your code you are checking for empty which is causing the error.

If you are checking for empty then modify your code as