"Failed to load viewstate" When There Are No Dynamic Controls

[scottcly]

I have a simple editor with a Gridview and a DetailsView. The Gridview handles DELETE and the DetailsView handles UPDATE and ADD. A panel around each one and some minor event handling is used to control which one is visible based on buttons pushed. I can do single operations, but I get an error when I click SELECT on the GRIDVIEW, then UPDATE on the DetailsView then SELECT on the Gridview again.

I will have to send the code in a follow-on message, but here are the error details.

Thanks.

[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.Control.LoadViewStateRecursive(Objec t savedState) +355
System.Web.UI.Control.LoadChildViewStateByIndex(Ar rayList childState) +142
System.Web.UI.Control.LoadViewStateRecursive(Objec t savedState) +303
System.Web.UI.Control.LoadChildViewStateByIndex(Ar rayList childState) +142
System.Web.UI.Control.LoadViewStateRecursive(Objec t savedState) +303
System.Web.UI.Control.LoadChildViewStateByIndex(Ar rayList childState) +142
System.Web.UI.Control.LoadViewStateRecursive(Objec t savedState) +303
System.Web.UI.Control.LoadChildViewStateByIndex(Ar rayList childState) +142
System.Web.UI.Control.LoadViewStateRecursive(Objec t savedState) +303
System.Web.UI.Control.LoadChildViewStateByIndex(Ar rayList childState) +142
System.Web.UI.Control.LoadViewStateRecursive(Objec t savedState) +303
System.Web.UI.Control.LoadChildViewStateByIndex(Ar rayList childState) +142
System.Web.UI.Control.LoadViewStateRecursive(Objec t savedState) +303
System.Web.UI.Control.LoadChildViewStateByIndex(Ar rayList childState) +142
System.Web.UI.Control.LoadViewStateRecursive(Objec t savedState) +303
System.Web.UI.Control.LoadChildViewStateByIndex(Ar rayList childState) +142
System.Web.UI.Control.LoadViewStateRecursive(Objec t savedState) +303
System.Web.UI.Control.LoadChildViewStateByIndex(Ar rayList childState) +142
System.Web.UI.Control.LoadViewStateRecursive(Objec t savedState) +303
System.Web.UI.Control.LoadChildViewStateByIndex(Ar rayList childState) +142
System.Web.UI.Control.LoadViewStateRecursive(Objec t savedState) +303
System.Web.UI.Page.LoadAllState() +505
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +2543

[scottcly]

Here is the code behind:

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
 
public partial class Member_Administrator_Product_States : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
 
    }
  protected void cmdAdd_Click(object sender, EventArgs e)
  {
    pnlGrid.Visible = false;
    DetailsView1.ChangeMode(DetailsViewMode.Insert);
    pnlDetail.Visible = true;
  }
  protected void cmdSelect_Click(object sender, EventArgs e)
  {
    pnlGrid.Visible = false;
    DetailsView1.ChangeMode(DetailsViewMode.Edit);
    pnlDetail.Visible = true;
  }
  protected void DetailsView1_ItemUpdated(object sender, DetailsViewUpdatedEventArgs e)
  {
    if (e.Exception != null)
    {
      lblErrorMsg.Text = "Invalid data. Please correct and try again.";
      e.ExceptionHandled = true;
      e.KeepInEditMode = true;
    }
    else if (e.AffectedRows == 0)
      lblErrorMsg.Text = "Another user updated that category. Please try again.";
  }
  protected void DetailsView1_ItemDeleted(object sender, DetailsViewDeletedEventArgs e)
  {
    if (e.Exception != null)
    {
      lblErrorMsg.Text = e.Exception.Message;
      e.ExceptionHandled = true;
    }
    else
      if (e.AffectedRows == 0)
        lblErrorMsg.Text = "Another user updated that category. Please try again.";
  }
  protected void DetailsView1_ItemInserted(object sender, DetailsViewInsertedEventArgs e)
  {
    if (e.Exception != null)
    {
      lblErrorMsg.Text = "Invalid data. Please correct and try again.";
      e.ExceptionHandled = true;
      e.KeepInInsertMode = true;
    }
    else if (e.AffectedRows == 0)
      lblErrorMsg.Text = "Another user updated that category. Please try again.";
  }
  protected void DetailsView1_ItemCommand(object sender, DetailsViewCommandEventArgs e)
  {
    switch (e.CommandName) { 
      case "Cancel":
      case "Update":
      case "Insert":
        pnlGrid.Visible = true;
        pnlDetail.Visible = false;
        break;
      default:
        break;
    }
  }
}

[scottcly]

I am having trouble sending the script. When I attempt to post it, I get the following message even though there are no image tags in my script or my signature. I am a first-time poster, so anything is possible.

[scottcly]

You have included too many images in your signature or in your previous post. Please go back and correct the problem and then continue again.

Images include use of smilies, the vB code [img] tag and HTML <img> tags. The use of these is all subject to them being enabled by the administrator.

[scottcly]

I have re-posted this in the appropriate Web Developers forum where it belongs. I apologize if you read this far because I am new to your forum.