用MFC編程時，通過ADO連接數據庫，需要用到ADO相關的ActiveX控件，在VC++6.0中是默認有的，但VS2010中必須要手動添加。在對話框中添加控件時，若遇到“未能實例化activex控件 因為這需要設計時授權”提示，解決辦法如步驟3。
具體步驟如下：
1、下載*.ocx文件
最常用的三個為：MSADODC.OCX，MSDATGRD.OCX，MSDATLST.OCX，並把它們保存在目錄C:\Windows\System32下
各個控件需要的文件以及包含的控件如下：
Microsoft ADO Data Control 6.0 MSADODC.OCX ADO Data Control
Microsoft Data Grid Control 6.0 MSDATGRD.OCX DataGrid
Microsoft Data List Controls 6.0 MSDATLST.OCX DataList, DataCombo
Microsoft Data Bound Grid Control 5.0 DBGRID32.OCX DBGrid
Microsoft Data Bound List Controls 6.0 DBLIST32.OCX DBList, DBCombo
Microsoft Data Repeater Control 6.0 MSDATREP.OCX DataRepeater
Microsoft FlexGrid Control 6.0 MSFLXGRD.OCX MSFlexGrid
2、注冊
開始-->運行/命令提示符-->輸入regsvr32 msadodc.ocx，回車后會彈出注冊成功提示框
或者在VS的工具-->VisualStdio 命令提示符下輸入regsvr32 msadodc.ocx
注冊完所有需要的文件之后，在VS2010的工具-->選擇工具箱項，COM組件中，找到相應的控件名，勾選並確定。這時在資源視圖中就可以右鍵-->添加ActiveX控件中選擇相應控件了
3、“未能實例化activex控件 因為這需要設計時授權”解決辦法
若添加控件時，彈出提示框“未能實例化activex控件 因為這需要設計時授權”，則可以找到VC++6.0安裝文件中的*.reg文件，雙擊導入注冊表。
若還未能解決，可新建文本文件，將下面的文字復制，重命名為adocontrol.reg。雙擊導入注冊表，再添加控件就不會提示出錯了。
REGEDIT
HKEY_CLASSES_ROOT\Licenses = Licensing: Copying the keys may be a violation of established copyrights.
// Masked Edit Control 6.0 license key
HKEY_CLASSES_ROOT\Licenses\BC96F860-9928-11cf-8AFA-00AA00C00905 = mmimfflflmqmlfffrlnmofhfkgrlmmfmqkqj
// Chart Control 6.0 (OLEDB) license key
HKEY_CLASSES_ROOT\Licenses\12B142A4-BD51-11d1-8C08-0000F8754DA1 = aadhgafabafajhchnbchehfambfbbachmfmb
// Common Dialog Control 6.0 license key
HKEY_CLASSES_ROOT\Licenses\4D553650-6ABE-11cf-8ADB-00AA00C00905 = gfjmrfkfifkmkfffrlmmgmhmnlulkmfmqkqj
// ADO Data Control 6.0 (OLEDB) license key
HKEY_CLASSES_ROOT\Licenses\C4145310-469C-11d1-B182-00A0C922E820 = konhqhioohihphkouimonhqhvnwiqhhhnjti
// Common Controls-3 6.0 license key
HKEY_CLASSES_ROOT\Licenses\38911DA0-E448-11D0-84A3-00DD01104159 = mcpckchcdchjcjcclidcgcgchdqdcjhcojpd
// Windows Common Controls-2 5.0 (SP2) license key
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// Windows Common Controls license key
HKEY_CLASSES_ROOT\Licenses\57CBF9E0-6AA7-11cf-8ADB-00AA00C00905 = aahakhchghkhfhaamghhbhbhkbpgfhahlfle
// Data Bound Grid Control 5.0(SP3) license key
HKEY_CLASSES_ROOT\Licenses\556C75F1-EFBC-11CF-B9F3-00A0247033C4 = xybiedobrqsprbijaegcbislrsiucfjdhisl
// Data Bound List Controls 6.0 license key
HKEY_CLASSES_ROOT\Licenses\096EFC40-6ABF-11cf-850C-08002B30345D = knsgigmnmngnmnigthmgpninrmumhgkgrlrk
// Internet Transfer Control 6.0 license key
HKEY_CLASSES_ROOT\Licenses\78E1BDD1-9941-11cf-9756-00AA00C00908 = yjrjvqkjlqqjnqkjvprqsjnjvkuknjpjtoun
// Multimedia Control 6.0 license key
HKEY_CLASSES_ROOT\Licenses\B1EFCCF0-6AC1-11cf-8ADB-00AA00C00905 = qqkjvqpqmqjjpqjjvpqqkqmqvkypoqjquoun
// Chart Control 6.0 license key
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// Windows Common Controls-2 6.0 license key
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// Windows Common Controls 6.0 license key
HKEY_CLASSES_ROOT\Licenses\ED4B87C4-9F76-11d1-8BF7-0000F8754DA1 = knlggnmntgggrninthpgmnngrhqhnnjnslsh
// Comm Control 6.0 license key
HKEY_CLASSES_ROOT\Licenses\4250E830-6AC2-11cf-8ADB-00AA00C00905 = kjljvjjjoquqmjjjvpqqkqmqykypoqjquoun
// DataGrid Control 6.0 (OLEDB) license key
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// DataList Control 6.0 (OLEDB) license key
HKEY_CLASSES_ROOT\Licenses\A133F000-CCB0-11d0-A316-00AA00688B10 = cibbcimbpihbbbbbnhdbeidiocmcbbdbgdoc
// DBWin license key
HKEY_CLASSES_ROOT\Licenses\D015B071-D2ED-11d0-A31A-00AA00688B10 = gjdcfjpcmjicjcdcoihcechjlioiccechepd
// MSDBRPT license key
HKEY_CLASSES_ROOT\Licenses\9DF1A470-BA8E-11D0-849C-00A0C90DC8A9 = cchcqjejhcgcqcfjpdfcdjkckiqikchcojpd
// FlexGrid Control 6.0 license key
HKEY_CLASSES_ROOT\Licenses\72E67120-5959-11cf-91F6-C2863C385E30 = ibcbbbebqbdbciebmcobmbhifcmciibblgmf
// MAPI Controls 6.0 license key
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// Windowless Controls 6.0 license key
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// Rich TextBox Control 6.0 license key
HKEY_CLASSES_ROOT\Licenses\DC4D7920-6AC8-11cf-8ADB-00AA00C00905 = iokouhloohrojhhhtnooiokomiwnmohosmsl
// Sheridan Tab Control license key
HKEY_CLASSES_ROOT\Licenses\190B7910-992A-11cf-8AFA-00AA00C00905 = gclclcejjcmjdcccoikjlcecoioijjcjnhng
// SysInfo Control 6.0 license key
HKEY_CLASSES_ROOT\Licenses\E32E2733-1BC5-11d0-B8C3-00A0C90DCA10 = kmhfimlflmmfpffmsgfmhmimngtghmoflhsg
// Winsock Control 6.0 license key
HKEY_CLASSES_ROOT\Licenses\2c49f800-c2dd-11cf-9ad6-0080c7e7b78d = mlrljgrlhltlngjlthrligklpkrhllglqlrk