Traverse Data From Form1 To Another Form?

im working on windows application.In this Application iam using two forms one form is for save and modifying the details of the Patient. This First form contains a 'Find Patient' Button .when we click on button. new form will be open code in the 'Find Patient' button click

'open a form2 from form1
dim f2 as new form2
f2.show

In this form2 iam searching for particular patient according to their Id and retrieveing all the details of the patient in a datagridview wat i have to do is when i click on any cell in datagridview of a particular employee . the details of the particular employee should be shown on the first form1 by hiding this second form2'code in the datagridview_celldoubleclick()

Private Sub grv_Patientdetails_CellDoubleClick(ByVal sender As Object, ByVal e As System.Windows.Forms.DataGridViewCellEventArgs) Handles grv_Patientdetails.CellDoubleClick
Try

[code].....

data will be retreiveing correctly. but it is opening in a new form but already old form1 is opened beneath the form2 ? new form should not be opened and data should be retrieved in the first form which is already opened how should i do this?