Grideview Bound field is not allowing me to display Null Data.

I need the null fields to just be blank or display the text "open", but it shows "1/1/1900" in the gridview column.  Thanks.  
<asp:BoundField DataField="End_Date" HeaderText="<%$ Resources:Resource, GridView6 %>" NullDisplayText="no data" DataFormatString="{0:d}"
                    SortExpression="End_Date" >
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NullDisplayText works only with null values. DateTime is value type, so it can't be null.
Consider using RowDataBound event and manually check for the values and replace them.
in row databound event, check if(End_Date<DateTime.MinValue) and display text as needed.

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