I am making an application in c#.net framework, I am creating an application that is a registry in which I use c# and mysql. What I am doing is creating a form with a student information database title but when I run the application and enter the data so that it is registered in the mysql student database it does not load, instead it sends me an error message what does this say:

enter image description here

I have reviewed the code but I cannot understand what the error could be and be able to move forward since according to the logic it is not doing what I want, which at the moment is entering data from a form and that when I click on the register button, that data will be sent to mysql.