How to redirect to another page and call its function from source page

I have 2 aspx page:
1>companyMaster(CM) 2>CompanyBranchMaster(CBM)
In CompanyMaster ihave a gridview (listing all companyBranches) with select,Update,Delete button on it.On clicking select of anyone row in gridview ,it should redirect to CompanyBranchMaster page and there is a funciton in it dbSelectGrid to show the details of that Branch in form.
CompanyBranchMaster page contains a form with all the required fields and gridview and its funcitons.
My Question is if user clicks on grid of CM then it can be redirected to CBM with Response.Redirect.But how to call the function dbSelectGrid of CBMs page.
I hope my qtn is clear..
Thanks in advance!!!
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