a call to bind was not well formed ?

I am trying to set the value  of a date when it is null from a different control but I get the following error : a call to bind was not well formed

-- error with this because of the conditional statement 
    <telerik:RadDatePicker  ID="radBillPeriodStartDate1" Skin="Office2007" Style="vertical-align: middle;"
                            runat="server" 
                            DbSelectedDate='<%# Bind("END_BILLING_PERIOD","{0:D}") == DBNull.Value ? radBillPeriodEndDate.SelectedDate : Bind("END_BILLING_PERIOD","{0:D}") %>'
                            >
                    
-- this works fine when there is no conditional statement 
 
     <telerik:RadDatePicker ID="radBillPeriodEndDate1"  Skin="Office2007" Style="vertical-align: middle;"
                            runat="server" DbSelectedDate='<%# Bind("END_BILLING_PERIOD", "{0:d}") %>'
                            >

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tech_questionAsked:
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nmarunCommented:
See what happens when you try something like this:

    <telerik:RadDatePicker  ID="radBillPeriodStartDate1" Skin="Office2007" Style="vertical-align: middle;"
                            runat="server"
                            DbSelectedDate='<%# GetDateValue(Bind("END_BILLING_PERIOD","{0:D}").ToString()) %>'
                            >
and in the code-behind:

public DateTime GetDateValue(string endBillingPeriod)
{
      DateTime retValue;
      if(endBillingPeriod == null)
      {
           retValue = radBillPeriodEndDate.SelectedDate;
      }
      else
      {
            retValue = DateTime.Parse(endBillingPeriod);
       }
}
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tech_questionAuthor Commented:
I changed it, I had to change the method type to protected but now it tells me CS0103: The name 'Bind' does not exist in the current context
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nmarunCommented:
Try using Eval:

  <telerik:RadDatePicker  ID="radBillPeriodStartDate1" Skin="Office2007" Style="vertical-align: middle;" runat="server"
                            DbSelectedDate='<%# GetDateValue(Eval("END_BILLING_PERIOD","{0:D}").ToString()) %>' >
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tech_questionAuthor Commented:
I did this and it seems to work but now the problem is in add mode, when I insert an item , the value associated to it is null  - is there anything that I can try ?

DbSelectedDate='<%#GetDateValue(Convert.ToDateTime(DataBinder.Eval(Container.DataItem, "BEGIN_BILLING_PERIOD")))%>'
protected DateTime GetDateValue(DateTime d)
    {
        DateTime retValue;
        if (d == null)
        {
            retValue = DateTime.Parse(radBillPeriodEndDate.SelectedDate.ToString());
        }
        else
        {
            retValue = d;
            //Convert.ToDateTime(d, "{0:d}");
        }
        return retValue;
    }

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nmarunCommented:
What do you mean by:
the value associated to it is null

What is 'it' here? Is it the radBillPeriodEndDate control?
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tech_questionAuthor Commented:
it is the objectdatasource parameter that is bound to this control which is begin_billing_period.

  <asp:Parameter Name="BEGIN_BILLING_PERIOD" Type="DateTime" />
     
   <telerik:GridTemplateColumn HeaderText="Billing Period Start Date" UniqueName="BEGIN_BILLING_PERIOD"
                    EditFormColumnIndex="1">
                    <HeaderStyle Width="62px" />
                    <ItemTemplate>
                        <asp:Label runat="server" ID="lblBillingPeriodStartDate" Text='<%# Eval("BEGIN_BILLING_PERIOD", "{0:D}") %>'></asp:Label>
                    </ItemTemplate>
                    <EditItemTemplate>
                        <telerik:RadDatePicker  ID="radBillPeriodStartDate1" Skin="Office2007" Style="vertical-align: middle;"
                            runat="server"  DbSelectedDate='<%#GetDateValue(Convert.ToDateTime(DataBinder.Eval(Container.DataItem, "BEGIN_BILLING_PERIOD")))%>' 
                            MinDate='<%# DateTime.Now.AddMonths(Convert.ToInt32(ConfigurationManager.AppSettings["BillingMin"].ToString()))%>'
                            MaxDate='<%# DateTime.Now.AddMonths(Convert.ToInt32(ConfigurationManager.AppSettings["BillingMax"].ToString()))%>'
                            >
                        <Calendar ShowRowHeaders="false" />
                        </telerik:RadDatePicker>
                        <asp:RequiredFieldValidator ID="rfvBillPeriodstartDate" runat="server" ControlToValidate="radBillPeriodStartDate1"
                            ErrorMessage="Billing Period Start Date must be within the range of 18 months in the past or 2 months in the future">*</asp:RequiredFieldValidator>
                    </EditItemTemplate>
                </telerik:GridTemplateColumn>
             

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nmarunCommented:
So what line is causing the break?
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tech_questionAuthor Commented:
when I add a record, by default it picks up the calendar control's date which is perfect but then it is unable to bind the value to the object datasource parameter (end_billing_period) , which by default takes it as null (which is 01/01/0001 for a datetime value). when I hit save , the value that is going to the database is 01/01/0001 not the value entered by the user. Does it makes sense ?
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tech_questionAuthor Commented:
thanks for pointing that article out. I looked at the article, it does not address my issue. If you look at the
code below      d = Convert.ToDateTime(radBillPeriodEndDate.SelectedDate); (I am not binding this value to the data. Is there any way to do this    
// DataBinder.Eval(dataItem, "BEGIN_BILLING_PERIOD") = radBillPeriodEndDate; ?
       
    protected DateTime GetDateString(object dataItem)
    {
        DateTime d ;
        
        if (DataBinder.Eval(dataItem, "BEGIN_BILLING_PERIOD") == DBNull.Value)
        {
           // DataBinder.Eval(dataItem, "BEGIN_BILLING_PERIOD") = radBillPeriodEndDate;
            d = Convert.ToDateTime(radBillPeriodEndDate.SelectedDate);
        }
 
        else
        {
            d = Convert.ToDateTime(DataBinder.Eval(dataItem, "BEGIN_BILLING_PERIOD"));
            
        }
        
        return d;
    }

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nmarunCommented:
tech_questions,

I'm kinda lost of in this issue. Here's is where I stand right know:

When you add new record to your database, you are not entering a date value to the end billing date field. So when you are binding it to the gridview, it is showing 01/01/0001 date and you want to know if there is a way out of this. Am I right? If not, please provide details.
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tech_questionAuthor Commented:
thanks for the link, I did the below for one of those articles and it works like a champ. Thank you.
 protected void gridInvLines_ItemCommand(object source, GridCommandEventArgs e)
    {
        
            switch (e.CommandName)
            {
 
                case RadGrid.InitInsertCommandName:
                    e.Canceled = true;
 
                    //this is for the Calendar Date control
                    System.Collections.Specialized.ListDictionary newValues = new System.Collections.Specialized.ListDictionary();
 
                    if(radBillPeriodStartDate.SelectedDate.HasValue)
                          newValues["BEGIN_BILLING_PERIOD"] = Convert.ToDateTime(radBillPeriodStartDate.SelectedDate);
                    if(radBillPeriodEndDate.SelectedDate.HasValue)
                          newValues["END_BILLING_PERIOD"]   = Convert.ToDateTime(radBillPeriodEndDate.SelectedDate);
 
                    e.Item.OwnerTableView.InsertItem(newValues);
 
                    break;
 
                default:
 
                    break;
        }
    }

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