To cast the C # control class to a different server type

The explicit conversions of the C # control class are primarily applied to some cast types, first using foreach for type estimation, and then converting the C # control class to the corresponding type.

Questions about forcing the C # control class to be cast to another server type

All server controls within the page are type-judged by foreach, and then they are converted from the C # control class to their respective types, if the textbox and so on ...

Question added:

foreach
(Control　ctl
in

this
.Controls)
{

if
(ctl的类型是Panel　而且　ID　是　PanelX)
　{
　　　将这个Panel失效,并且隐藏
　}

else
(ctl的类型是Panel　而且　ID　不是　PanelX)
　{
　　这个Panel有效,并且可见
}
}

C # control class for display conversions

foreach
(Control　ctrol
in

this
.panel1.Controls　)
{

if
　(　ctrol.GetType().ToString()　==　"System.Windows.Forms.TextBox"　)　)
{
TextBox　txt1=(TextBox)ctrol　;
}

else

if
(control
is
　System.Windows.Forms.Button)
　　　　{
　　　　　　　　//　control　object　转成　Button　object　类别
　　　　　　　　Button　button　=　(Button)control;
　　　　　　　　//　清除　Button　上面的文字
　　　　　　　　button.Text　=　"";
}
}

The standard method of judgment should be:

Obj. GetType () = = typeof (System.Windows.Forms.TextBox);