How to make all forms in a project as mdi child of mdi form.

In my winforms I have mdi form. Here I want to make all forms as child of mdi parent.

My forms structure are like this.

MainForm (Mdi parent)
FrmEmployeeDetails(child of MainForm)
FrmNewEmployeeDetails(child of FrmEmployeeDetails)

When I execute the project.form NewEmployeeDetails is opening outside the MainForm.

For FrmEmployeeDetails I coded like this.

FrmEmployeeDetails EmployeeDetails= new FrmEmployeeDetails();
EmployeeDetails.MDIparent=this;
EmployeeDetails.show();

FrmNewEmployeeDetails is child form of FrmEmployeeDetails.

For the form Fr开发者_StackOverflow中文版mEmployeeDetails I am creating NewEmployeeDetails as like this.

FrmNewEmployeeDetails newemployeedetails = new FrmNewEmployeeDetails();
newemployeedetails.show(); 

How can I make FrmNewEmployeeDetails as mdi child of MainForm.

Thanks in advance.

you should make this

FrmNewEmployeeDetails newemployeedetails = new FrmNewEmployeeDetails();
// Set the Parent Form of the Child window.
newemployeedetails.MdiParent = this;
// Display the new form.
newemployeedetails.Show();

Change the line

EmployeeDetails.MDIparent=this;

to

EmployeeDetails.MDIparent=this.MdiParent;