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format datetime as date in edititemtemplate of gridview

Posted on 2013-06-06
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Last Modified: 2013-06-27
Hi

I want to display the date only in a gridview column
The following gives me an error - bind doesnt exist in current context
How can I rectify?
 
                   <asp:Label ID="Labeldts" runat="server" Text='<%# Convert.ToDateTime(Bind("dtStart").ToString("dd/MM/yyyy")) %>'></asp:Label>
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Question by:louise_8
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Expert Comment

by:Rouchie
ID: 39224854
You should not try to do this.  ASP.NET will automatically format dates based on the user's computer settings, which is important!

You would have to use code-behind to inject the value using a custom date/time pattern if you really want to proceed.  See examples here that create a DateTimeFormatInfo object and format using that: http://msdn.microsoft.com/en-us/library/az4se3k1%28v=vs.71%29.aspx
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Expert Comment

by:Rouchie
ID: 39224881
However, if you're just wanting to remove the time part, you can do this:

                   <asp:Label ID="Labeldts" runat="server" Text='<%# Convert.ToDateTime(Bind("dtStart").ToShortDateString()) %>'></asp:Label>
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Author Comment

by:louise_8
ID: 39239835
Thanks Rouchie

Your 2nd comment is acorrect, I just need to remove the time when the date is displayed

I used your code: Text='<%# Convert.ToDateTime(Bind("dtStart").ToShortDateString()) %>'
However I get the error:       The name 'Bind' does not exist in the current context      

Cheers
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LVL 25

Expert Comment

by:Rouchie
ID: 39240182
Right okay this means you are going to have to use code-behind and push the date into the gridview that way.

Are you using any code-behind already for the gridview?  For example, do you have an OnRowDataBind event in your ASPX.VB/CS file?
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Accepted Solution

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Rouchie earned 100 total points
ID: 39240189
Anyway here's a full example if you don't already...
In page:
<asp:Label ID="Labeldts" runat="server"></asp:Label> 

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In code behind:
Protected Sub myGridViewID_RowDataBound(sender as object, e as GridViewRowEventArgs) Handles myGridViewID.RowDataBound
  Select Case e.Row.RowType
      Case DataControlRowType.DataRow
         Dim Labeldts As Label = CType(e.Row.FindControl("Labeldts"), Label)
         Labeldts.Text = Convert.ToDateTime(e.Row.DataItem("dtStart")).ToShortDateString
  End Select
End Sub

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Author Comment

by:louise_8
ID: 39243192
Thanks
Im almost there, not sure how to handle null values though:

This is the code that works excpet for null values for dtStart:

   DateTime dateToDisplay = Convert.ToDateTime(DataBinder.Eval(e.Row.DataItem, "dtStart"));
            Label Labeldts = e.Row.FindControl("Labeldts") as Label;
            Labeldts.Text = dateToDisplay.ToShortDateString();
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LVL 25

Expert Comment

by:Rouchie
ID: 39243581
That bit again is pretty easy (and applies to all other database columns of different types if you're wanting to format the output!)
Label Labeldts = e.Row.FindControl("Labeldts") as Label;
if (!Information.IsDBNull(e.Row.DataItem("dtStart"))) {
      DateTime dateToDisplay = Convert.ToDateTime(DataBinder.Eval(e.Row.DataItem, "dtStart"));
      Labeldts.Text = dateToDisplay.ToShortDateString(); 
} else {
      Labeldts.Text = "None"
}

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Author Comment

by:louise_8
ID: 39258138
Thanks Rouchie.. getting an error for Information
      The name 'Information' does not exist in the current context      

system namespace is already included..
c#
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Author Comment

by:louise_8
ID: 39258582
actually I've resolved that using
if (! Convert.IsDBNull(DataBinder.Eval(e.Row.DataItem, "dtStart")))

Thanks!

However it seems sometimes I get an error when I click edit:
'Object reference not set to an instance of an object.'
even though its in the if statement
  if (e.Row.RowType == DataControlRowType.DataRow && (e.Row.RowState & DataControlRowState.Edit) !=0 ) and shouldnt be executed
the line it points to is
  Labeldts.Text = dateToDisplay.ToShortDateString();
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