I want to build one Form that is a Parent window
and two windows for child windows
but my problem is this a code .I glad to see your suggest for this problem

dear nish here
do one thing first take mdi control from tool box
then write done any name like if on menu strip u gave File then in its below if u write New

now u have two things forms File & New

now in solution xplorer whatever ur pr ject name is given do right click on dat choose add windows form u get a dialog box then
write the name of the form As u specified in ur menu strip like File.cs
it vwill be added
now cum 2 ur main form where u made menu strip
double click on File u will get code window
now do this same as i done
File f=new File();
do the same vid other optin as welljust change the name of file
now when u run ur form click on the file u will get a new form
byee take care