Failed to load ViewState.

[nithagowda]

Hello,

I have a DropDownList for source type and a panel for displaying TreeView based on the source type.. The problem is- if i select different source type drom ddlSrcType, other than the item which was selected in the previous run the following error message is displayed.. Please help me in this regard..

Failed to load viewstate. The control tree into which viewstate is being loaded must match the control tree that was used to save viewstate during the previous request. For example, when adding controls dynamically, the controls added during a post-back must match the type and position of the controls added during the initial request.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.Web.Http Exception: Failed to load viewstate. The control tree into which viewstate is being loaded must match the control tree that was used to save viewstate during the previous request. For example, when adding controls dynamically, the controls added during a post-back must match the type and position of the controls added during the initial request.

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace:

[HttpException (0x80004005): Failed to load viewstate. The control tree into which viewstate is being loaded must match the control tree that was used to save viewstate during the previous request. For example, when adding controls dynamically, the controls added during a post-back must match the type and position of the controls added during the initial request.]
System.Web.UI.C ontrol.LoadView StateRecursive( Object savedState) +483
System.Web.UI.C ontrol.LoadChil dViewStateByInd ex(ArrayList childState) +195
System.Web.UI.C ontrol.LoadView StateRecursive( Object savedState) +424
System.Web.UI.C ontrol.LoadChil dViewStateByInd ex(ArrayList childState) +195
System.Web.UI.C ontrol.LoadView StateRecursive( Object savedState) +424
System.Web.UI.C ontrol.LoadChil dViewStateByInd ex(ArrayList childState) +195
System.Web.UI.C ontrol.LoadView StateRecursive( Object savedState) +424
System.Web.UI.C ontrol.LoadChil dViewStateByInd ex(ArrayList childState) +195
System.Web.UI.C ontrol.LoadView StateRecursive( Object savedState) +424
System.Web.UI.C ontrol.LoadChil dViewStateByInd ex(ArrayList childState) +195
System.Web.UI.C ontrol.LoadView StateRecursive( Object savedState) +424
System.Web.UI.P age.LoadAllStat e() +559
System.Web.UI.P age.ProcessRequ estMain(Boolean includeStagesBe foreAsyncPoint, Boolean includeStagesAf terAsyncPoint) +2238


Version Information: Microsoft .NET Framework Version:2.0.507 27.832; ASP.NET Version:2.0.507 27.832

Nitha