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Newbie here, whenever I dont input/input letter then click next button I get this error[System.FormatException: 'Input string was not in a correct format.' ] I dont know what to do. I just follow the instructionenter image description hereenter image description here

Im expecting whenever I clicked Nextbutton, I dont get that error.

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  • Welcome to Stack Overflow! 1) Please do not upload images of code/errors when asking a question. 2) The error means that the value in the TextBox cannot be converted to an int. Consider using int.TryParse() instead of Convert.ToInt32(). Commented Oct 28, 2022 at 9:14
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    Does this answer your question? Not able to cast string to int. Error msg: Input string was not in a correct format Commented Oct 28, 2022 at 9:16
  • If you don't enter anything in the textbox, that mean it is an empty string. Empty string can not be converted to a number, that's why you are getting this error. If you don't expect and empty string then you should put a check if(!string.IsNullOrEmpty(txtStudentNo.Text)) before converting it to a number. Commented Oct 28, 2022 at 9:16
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