Bind Multiple controls with Dropdown List

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C#

ASP.NET

Hi
Please help since this is my first project i need your valuable suggestions

I have the below tables

Table Name           PrimaryKey      ForeignKey

CustomerDetails       CustomerId       userid
ItemParent             Dono            CustomerId
Items                  sno             Dono

My UI(To print) consist of 3 Textboxes --- value from CustomerDetails
Detail View -- value from CustomerDetails
Grid view --- Value from Items,ItemParent

My confusion is when i select a dono all this control should display related information related to that dono. How do i do this?

Thanks