Single Value
 Add the following hyperlink control after the <Columns> tag in the GridView as shown below:
<Columns>
<asp:HyperLinkField DataNavigateUrlFields="CustomerID" DataNavigateUrlFormatString="CustomerDetails.aspx?CID={0}" Text="Pass Single Value" />

Multiple Values:

Just below the first hyperlink field, add another hyperlink field as shown below:
<asp:HyperLinkField DataNavigateUrlFields="CustomerID, CompanyName, ContactName, Address, City" DataNavigateUrlFormatString="CustomerDetails.aspx?CID={0}&CName={1}&ContactName={2}&Addr={3}&City={4}" Text="Pass Multiple Values" />