Yes, this probably would be a better solution.

>You could put tests for DBNull.Value in your sets and default the null to something. So, for example:
>
>

>    public bool EditMode
>    {
>        get { return editMode ; }
>        set {
>            if (value == DBNull.Value)
>                value = false;
>
>            editMode = value;
>            clseditmode.SetEnabled(this.Controls, value);
>        }
>    }
>

>
>~~Bonnie
>
>
>
>
>>Hi everybody,
>>
>>I've added new conditional tab to my FormView. I'm getting System.InvalidCastException was unhandled by user code
>> Message="Specified cast is not valid."
>>
>> at System.Web.UI.Control.OnDataBinding(EventArgs e)
>> at System.Web.UI.Control.DataBind(Boolean raiseOnDataBinding)
>> at System.Web.UI.Control.DataBind()
>> at System.Web.UI.Control.DataBindChildren()
>> InnerException:
>>
>>I retrieve the data using LEFT JOIN, so my fields are NULL. Here is what I put on the ASPX
>>

>>  <!-- 6th -->
>>                                <div id="info6" class="cl dn">
>>                                    <MembInfo:MembershipInfo ID="MembershipInfoRegular" runat="server"
>>                                    BillQuaterly ='< %# Bind("BillQuaterly") % >' IsMember ='< %# Bind("IsMember") % >'
>>                                    PaymentMethod='< %# Bind("PaymentMethod") % >' StartDate ='< %# Bind("StartDate") % >' />
>>                                </div>
>>                                <!-- /6th -->

>>
>>and this is my UserControl:
>>
>>

>>using System;
>>using System.Collections;
>>using System.Collections.Generic;
>>using System.Configuration;
>>using System.Data;
>>using System.Web;
>>using System.Web.Security;
>>using System.Web.UI;
>>using System.Web.UI.HtmlControls;
>>using System.Web.UI.WebControls;
>>using System.ComponentModel;
>>
>>public partial class Coordinator_UCD_MembershipInfo : System.Web.UI.UserControl
>>{
>>    #region Custom Properties
>>    ///
>>    /// <summary>The EditMode property is responsible for the Enabled style of the controls</summary>
>>    ///
>>    private bool editMode ;
>>    [Description("The EditMode property is responsible for the Enabled style of the controls"), DefaultValue(true),Category("User-Defined")]
>>    public bool EditMode
>>    {
>>        get { return editMode ; }
>>        set {
>>            editMode = value;
>>            clseditmode.SetEnabled(this.Controls, value);
>>        }
>>    }
>>
>>    [Bindable(true, BindingDirection.TwoWay), Category("User-Defined"),DefaultValue(false),Description("Is User a Member?")  ]
>>    public bool? IsMember
>>    {
>>        get
>>        {
>>            return this.chkIsMember.Checked;
>>        }
>>        set
>>        {
>>            this.chkIsMember.Checked = Convert.ToBoolean(value);
>>        }
>>    }
>>    [Bindable(true, BindingDirection.TwoWay), Category("User-Defined"), DefaultValue(false), Description("Bill Quaterly?")  ]
>>    public bool? BillQuaterly
>>    {
>>        get
>>        {
>>            return this.chkBillQuaterly.Checked;
>>        }
>>        set
>>        {
>>            this.chkBillQuaterly.Checked = Convert.ToBoolean(value);
>>        }
>>    }
>>
>>    [Bindable(true, BindingDirection.TwoWay), Category("User-Defined"), DefaultValue(""), Description("Payment Method") ]
>>    public string PaymentMethod
>>    {
>>        get
>>        {
>>            return this.ddlPaymentMethod.SelectedValue;
>>        }
>>        set
>>        {
>>            this.ddlPaymentMethod.SelectedValue = value;
>>        }
>>    }
>>    [Bindable(true, BindingDirection.TwoWay), Category("User-Defined"), Description("Membership Begin Date") ]
>>    public DateTime? StartDate
>>    {
>>        get
>>        {
>>            return Convert.ToDateTime(this.txtMembershipStartDate.Text) ;
>>        }
>>        set
>>        {
>>            this.txtMembershipStartDate.Text = (Convert.ToDateTime(value)).ToShortDateString() ;
>>        }
>>    }
>>   #endregion
>>    protected void Page_Load(object sender, EventArgs e)
>>    {
>>
>>    }
>>}
>>

>>
>>I'm not sure what should I do to make it work correctly with NULLs. I tried to change data types to be nullable, but this didn't help.
>>
>>Thanks a lot in advance.