以下文字与答案无关
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Public class MyControl: UserControl{
public MyControl(){
TextBox textBox1=new TextBox();
Button button1=new Button();
button1.Top=textBox1.Height;
this.Controls.Add(textBox1);
this.Controls.Add(button1);
}}
B:Public class MyControl: UserControl{
TextBox textBox1=new TextBox();
Button button1=new Button();
button1.Top=textBox1.Height;
this.Controls.Add(textBox1);
this.Controls.Add(button1);
}
C:Public class MyControl: TextBox,Button{
public MyControl(){
TextBox textBox1=new TextBox();
Button button1=new Button();
button1.Top=textBox1.Height;
this.Controls.Add(textBox1);
this.Controls.Add(button1);
}}
D:Public class MyControl: TextBox,Button{
TextBox textBox1=new TextBox();
Button button1=new Button();
button1.Top=textBox1.Height;
this.Controls.Add(textBox1);
this.Controls.Add(button1);
}