我添加了 .txtDob
的 .Text 属性.

cmd.Parameters.AddWithValue("@datBirth", txtDob.Text);

这行可能是问题-cmd.Parameters.AddWithValue("@datAdmission", txtdatAdmission);
确保在此字段中传递有效的日期时间格式.

This line could be the problem - cmd.Parameters.AddWithValue("@datAdmission", txtdatAdmission);
Make sure you pass a valid datetime format in this field.

需要在下面添加，以及Sunsara建议的

Need to add for below as well as Sunsara suggested

cmd.Parameters.AddWithValue("@datAdmission", txtdatAdmission);
           cmd.Parameters.AddWithValue("@strName", txtStudentName);