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8.7

ASP.NET Formview control dropdownlist SelectedIndexChanged problem

Asked by DeMyu in Programming for ASP.NET

Tags: ASP.NET, VB, Formview

I have problems getting the Formview control with two dependent dropdownlists to work in Edit Mode. I have say dropdownlist A and dropdownlist B where Dropdownlist B is dependent on dropdownlist A.

My goal is such that when a user clicks the edit button in the Formview the selectedvalues of dropdownlist A and dropdownlist B should be the values obtained from the database.

Here is the error message that I am receiving from the web server when I click edit to put the formview into edit mode.

Databinding methods such as Eval(), XPath(), and Bind() can only be used in the context of a databound control.
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.InvalidOperationException: Databinding methods such as Eval(), XPath(), and Bind() can only be used in the context of a databound control.

The error disappears when I remove SelectedValue='<%# Bind("appID") %>'  from

<asp:DropDownList ID="dropApplication" runat="server" DataTextField="appName" DataValueField="appID" SelectedValue='<%# Bind("appID") %>' />

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<asp:FormView ID="FormView1" runat="server" DataKeyNames="romID">
							<EditItemTemplate>
								<table class="tblborder">
 <tr>
										<td class="formlabel"><LABEL class="reqlabel" for="dropComponent">Component:</LABEL><span class="form-required">*</span></td>
										<td align="left">	
									<asp:DropDownList ID="dropComponent" runat="server" DataSourceID="SqlDataSource01" DataTextField="orgName" DataValueField="orgID" AppendDataBoundItems="true" AutoPostBack="True" SelectedValue='<%# Bind("orgID") %>' OnSelectedIndexChanged="dropComponent_SelectedIndexChanged">
                                    <asp:ListItem Value="">
                                            -- Choose a component --
                                        </asp:ListItem>
		                           </asp:DropDownList>
		                           </td>
		                           <td><asp:RequiredFieldValidator runat="server" Display="Dynamic" ControlToValidate="dropComponent" ErrorMessage="<img src='images/common/required_trans.gif' align='absmiddle'>" />
									</td>
									</tr>
									<tr>
										<td class="formlabel"><LABEL class="reqlabel" for="dropApplication">Application:</LABEL><span class="form-required">*</span></td>
										<td align="left">	
									<asp:DropDownList ID="dropApplication" runat="server" DataTextField="appName" DataValueField="appID" SelectedValue='<%# Bind("appID") %>' />
                                    
		                           </td>
		                           <td><asp:RequiredFieldValidator runat="server" Display="Dynamic" ControlToValidate="dropApplication" ErrorMessage="<img src='images/common/required_trans.gif' align='absmiddle'>" />
									</td>
									</tr>
</table>
							</EditItemTemplate>	
 
 
----- codebehind
 
Sub dropComponent_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs)
 
        FormView1.ChangeMode(FormViewMode.Edit)
 
        Dim dropApplication As DropDownList = CType(FormView1.FindControl("dropApplication"), DropDownList)
        Dim dropComponent As DropDownList = CType(FormView1.FindControl("dropComponent"), DropDownList)
 
        dropApplication.Items.Clear()
 
        Dim objConn As SqlConnection = New SqlConnection(ConfigurationManager.ConnectionStrings("APPdbConnectString").ConnectionString)
 
        Dim cmdSQL As New SqlCommand("dbo.P_applications_show_active", objConn)
 
        cmdSQL.CommandType = CommandType.StoredProcedure
        cmdSQL.Parameters.Add(New SqlParameter("@orgID", SqlDbType.INT, 4)).Value = dropComponent.SelectedItem.Value
 
        Dim sqlDR As SqlDataReader
 
        Try
            objConn.Open()
 
            sqlDR = cmdSQL.ExecuteReader(CommandBehavior.CloseConnection)
 
            dropApplication.DataSource = sqlDR
            dropApplication.DataBind()
        Catch myException As Exception
            Message.InnerHtml = "<tr><th height=""25"" class=""thmsg"" colspan=""3"" nowrap=""nowrap"">" & myException.ToString() & "</th></tr>"
 
        Finally
            If Not sqlDR Is Nothing Then
                sqlDR.Close()
            End If
            dropApplication.Items.Insert(0, New ListItem("-- Choose an application --", ""))
            dropApplication.SelectedIndex = 0
        End Try
 
    End Sub
[+][-]09/11/09 11:23 PM, ID: 25315416Expert Comment

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[+][-]09/14/09 12:27 PM, ID: 25328473Accepted Solution

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About this solution

Zone: Programming for ASP.NET
Tags: ASP.NET, VB, Formview
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Solution Provided By: carlnorrbom
Participating Experts: 1
Solution Grade: A
 
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