如果数据无效，请使用IsValidData()方法调用textBox1.Focus()方法，而不要使用ReEnter变量和事件. .

Call the textBox1.Focus() method on the IsValidData() method if the data is not valid instead of using the ReEnter variable and events.

Hi应该是if(M.DialogResult == DialogResult.OK). Single =是赋值运算符，不是比较运算符.如果它是一个简单的消息框，则可以使用内置的System.Windows.Forms.MessageBox.不需要单独的表格.

祝你好运

Hi should be if(M.DialogResult == DialogResult.OK). Single = is an assignment operator, not compare operator. If it is a simple message box you can use inbuilt System.Windows.Forms.MessageBox. No need a separate form.

Good luck