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Saving/serializing treeView control into ViewState Messages   Related Types This message was discovered on ASPFriends.com 'aspngwebcontrols' list. Emmely -- Moved from [aspngfreeforall] to [aspngwebcontrols] by Tony Stark <Click here to reveal e-mail address> -- -- Moved from [aspngdatagridrepeaterdatalist] to [aspngfreeforall] by Tony Stark <Click here to reveal e-mail address> -- Hi, I have created a user control (ascx) which has a 'treeview' control inside of it and I want to save the state of this treeview into ViewState. Some background information: This control is embedded in an aspx file which has a table set up so that different pages can be loaded into a different cell depending on which node the user clicked in the tree (eg. Menu navigation on left side of screen, page loaded in middle of screen) The initial problem I experienced was that the entire menu collapsed when a page is being loaded into the middle of the screen. Hence we needed to save the treeview's state into ViewState so that when a page is loaded the treeview menu remembered its own state and did not collapse. I then tried the following code to attempt to save it into viewState (where TreeView1 = Microsoft.Web.UI.WebControls.TreeView): Protected Overrides Function SaveViewState() As Object Viewstate("TreeView1") = Me.TreeView1 Return MyBase.SaveViewState() End Function However, this error then appeared: "Type 'Microsoft.Web.UI.WebControls.TreeView' must be marked as Serializable or have a TypeConverter other than ReferenceConverter to be put in viewstate." I then added the <Serializable()> _ attribute to my class but this did not make a difference, and you also cannot inherit TypeConverter as a user control already inherits System.Web.UI.UserControl by defaut. If anyone has any suggestions in how I maintain the state of my treeView control it would be much appreciated J Thanks, Emmely Reply to this message...        Emmely -- Moved from [aspngcache] to [aspngwebcontrols] by Tony Stark <Click here to reveal e-mail address> -- Hi, I have created a user control (ascx) which has a 'treeview' control inside of it and I want to save the state of this treeview into ViewState. Some background information: This control is embedded in an aspx file which has a table set up so that different pages can be loaded into a different cell depending on which node the user clicked in the tree (eg. Menu navigation on left side of screen, page loaded in middle of screen) The initial problem I experienced was that the entire menu collapsed when a page is being loaded into the middle of the screen. Hence we needed to save the treeview's state into ViewState so that when a page is loaded the treeview menu remembered its own state and did not collapse. I then tried the following code to attempt to save it into viewState (where TreeView1 = Microsoft.Web.UI.WebControls.TreeView): Protected Overrides Function SaveViewState() As Object Viewstate("TreeView1") = Me.TreeView1 Return MyBase.SaveViewState() End Function However, this error then appeared: "Type 'Microsoft.Web.UI.WebControls.TreeView' must be marked as Serializable or have a TypeConverter other than ReferenceConverter to be put in viewstate." I then added the <Serializable()> _ attribute to my class but this did not make a difference, and you also cannot inherit TypeConverter as a user control already inherits System.Web.UI.UserControl by defaut. If anyone has any suggestions in how I maintain the state of my treeView control it would be much appreciated J Thanks, Emmely Reply to this message...     System.ComponentModel.ReferenceConverter System.ComponentModel.TypeConverter System.Web.UI.UserControl Ad MBR BootFX Best-of-breed application framework for .NET projects, developed by Matthew Baxter-Reynolds and MBR IT

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