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GeneralRe: Crytal reports Pin
yaswanth0011-Oct-12 7:04
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GeneralRe: Crytal reports Pin
Pete O'Hanlon1-Oct-12 9:42
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QuestionAndroid applications Pin
Member 940514026-Sep-12 6:24
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AnswerRe: Android applications Pin
Richard MacCutchan26-Sep-12 6:32
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AnswerRe: Android applications Pin
Abhinav S1-Oct-12 1:49
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QuestionJagged Array as Return Type from Function - Syntax Driving me Bonkers Pin
Mike-MadBadger25-Sep-12 6:50
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AnswerRe: Jagged Array as Return Type from Function - Syntax Driving me Bonkers Pin
Richard Deeming4-Oct-12 8:23
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GeneralRe: Jagged Array as Return Type from Function - Syntax Driving me Bonkers Pin
Mike-MadBadger4-Oct-12 20:43
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GeneralRe: Jagged Array as Return Type from Function - Syntax Driving me Bonkers Pin
Mike-MadBadger4-Oct-12 20:51
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Questionthe system.__ComObject Pin
majedksa25-Sep-12 1:30
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AnswerRe: the system.__ComObject Pin
Shameel25-Sep-12 1:55
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QuestionHelp with system.__ComObject Pin
majedksa25-Sep-12 1:29
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QuestionValidation of viewstate MAC failed. Pin
Sandeepkumar potu24-Sep-12 19:52
memberSandeepkumar potu24-Sep-12 19:52 
AnswerRe: Validation of viewstate MAC failed. Pin
Sandeep Mewara24-Sep-12 20:13
mvpSandeep Mewara24-Sep-12 20:13 
This exception generally appears because Controls using DataKeyNames require Viewstate to be encrypted. And the viewstate hidden field might not have been rendered to the browser with long-running pages, and if you make a postback before it does, the page doesn't know that Viewstate is encrypted and causes the aforementioned Exception.
The problem happens specifically when you postback before the EventValidation field has been rendered.

Workarounds:
1. Set enableEventValidation to false and viewStateEncryptionMode to Never OR
2. Mark the form as disabled and then enable it in script once the load is complete OR
3. Override the Render Event of the page to place the hidden fields for Encrypted Viewstate and Event validation on the top of the form

Have a look at this blog for full details: MSDN Blog: Validation of viewstate MAC failed error[^]
Sandeep Mewara
Microsoft ASP.NET MVP

[My latest Article]: Server side Delimiters in ASP.NET[^]

QuestionVB.NET with MSAccess Pin
kkct23-Sep-12 19:35
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AnswerRe: VB.NET with MSAccess Pin
Richard MacCutchan23-Sep-12 21:45
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AnswerRe: VB.NET with MSAccess Pin
Mazumder.Soumen25-Sep-12 2:22
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Questionresizing a form in corner, bottom,right Pin
gopal karmakar21-Sep-12 6:04
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QuestionRe: resizing a form in corner, bottom,right Pin
Eddy Vluggen21-Sep-12 6:20
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QuestionLookup table .NET Component Pin
HentoDeluxe21-Sep-12 5:26
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AnswerRe: Lookup table .NET Component Pin
Eddy Vluggen21-Sep-12 6:19
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QuestionConverting from base10 to base16 and save it in unsigned char array? Pin
Kiran Satish19-Sep-12 10:06
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AnswerRe: Converting from base10 to base16 and save it in unsigned char array? Pin
Richard MacCutchan19-Sep-12 11:28
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GeneralRe: Converting from base10 to base16 and save it in unsigned char array? Pin
Kiran Satish19-Sep-12 11:36
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GeneralRe: Converting from base10 to base16 and save it in unsigned char array? Pin
Richard MacCutchan19-Sep-12 11:52
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QuestionWhat is Common Type System (CTS) in .net framework? Pin
hiredotnet16-Sep-12 19:48
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AnswerRe: What is Common Type System (CTS) in .net framework? Pin
Pete O'Hanlon16-Sep-12 19:56
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AnswerRe: What is Common Type System (CTS) in .net framework? Pin
Himanshu Yadav20-Sep-12 8:11
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AnswerRe: What is Common Type System (CTS) in .net framework? Pin
Tadit Dash22-Sep-12 19:01
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QuestionMain components of .NET Framework Pin
hiredotnet16-Sep-12 19:45
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RantRe: Main components of .NET Framework Pin
Paul Conrad16-Sep-12 19:48
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Questioni m new in asp.net. and i want 2 call a gridview by dropdownlist. Pin
Rashid Choudhary13-Sep-12 22:27
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AnswerRe: i m new in asp.net. and i want 2 call a gridview by dropdownlist. Pin
Richard MacCutchan13-Sep-12 23:31
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GeneralRe: i m new in asp.net. and i want 2 call a gridview by dropdownlist. Pin
Rashid Choudhary13-Sep-12 23:36
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GeneralRe: i m new in asp.net. and i want 2 call a gridview by dropdownlist. Pin
Pete O'Hanlon13-Sep-12 23:40
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GeneralRe: i m new in asp.net. and i want 2 call a gridview by dropdownlist. Pin
Richard MacCutchan14-Sep-12 0:05
mvpRichard MacCutchan14-Sep-12 0:05 
GeneralRe: i m new in asp.net. and i want 2 call a gridview by dropdownlist. Pin
Pete O'Hanlon14-Sep-12 0:28
protectorPete O'Hanlon14-Sep-12 0:28 
GeneralRe: i m new in asp.net. and i want 2 call a gridview by dropdownlist. Pin
Richard MacCutchan14-Sep-12 0:44
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GeneralRe: i m new in asp.net. and i want 2 call a gridview by dropdownlist. Pin
Tadit Dash22-Sep-12 19:06
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AnswerRe: i m new in asp.net. and i want 2 call a gridview by dropdownlist. Pin
Meysam Tolouee14-Sep-12 9:01
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Questionbiztalk server Pin
srinuthippyreddy12-Sep-12 21:12
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AnswerRe: biztalk server Pin
Richard MacCutchan12-Sep-12 22:13
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QuestionMultiple Column ComboBox in VB.Net Pin
sivanesh.p12-Sep-12 2:49
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AnswerRe: Multiple Column ComboBox in VB.Net Pin
Bernhard Hiller12-Sep-12 3:51
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AnswerRe: Multiple Column ComboBox in VB.Net Pin
Dave Kreskowiak12-Sep-12 3:53
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AnswerRe: Multiple Column ComboBox in VB.Net Pin
hiredotnet16-Sep-12 19:41
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QuestionHow to disable No of copies in Print Dialog in C#.net Windows Application Pin
sr1599-Sep-12 23:13
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AnswerRe: How to disable No of copies in Print Dialog in C#.net Windows Application Pin
Eddy Vluggen10-Sep-12 2:45
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AnswerRe: How to disable No of copies in Print Dialog in C#.net Windows Application Pin
Pete O'Hanlon10-Sep-12 23:27
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QuestionRegarding datamining Pin
vinu Rajendran9-Sep-12 20:03
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