i need a little bit a help

hi guys
i have 2 little problems and i hope u will help me
first problem is i make a complete application i have a MDI form and others forms but they are not opening in the MDI form i want remaining forms as MDI child tell me how....
second is that i use datagrid i want to change in the data which is showing me in datagrid and update it but it gives error on my command sysytem Error
my query is
sqldataadapter1.updatecommand.executenonquery
tell me what can i do
thanks
Hammad Umar

Your main form must have its IsMDIParent property set to True.

When you open your child forms (from your main form) set their MdiParent property to Me before you show them.

VB Code:

frmChild1 = New Child1()
frmChild1.MdiParent = Me
frmChild1.Show