In this article I am going to explain how to replace null or
empty value with default message such as “-NA-“or “Data not available” in
asp.net Gridview.
Description:
I am showing list of Employees in gridview data control. Some
of columns are empty. I want to show a default message “-NA-“instead of empty
column.
Implementation:
Method 1:
NullDisplayText
Property of Gridview
NullDisplayText is used to show a predefined message/text if
column is empty/null. This property is working in BoundField.
E.g.
<asp:BoundField HeaderText="Name" DataField="Name" NullDisplayText="-NA-"> </asp:BoundField>
Method 2:
If you are using TemplateField in that case check column is
empty or not.
E.g.
<asp:TemplateField HeaderText="Email">
<ItemTemplate>
<asp:Label ID="lblemail" runat="server" Text='<%# Eval("EmailId").ToString()==""?"-NA-" :Eval("EmailId") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
*Note: In case of image you have to set NullImageUrl property in Imagefield. E.g.
<asp:ImageField DataImageUrlField="ImagePath" NullImageUrl="~/images/img-not-available.jpg" ControlStyle-Height="100" ControlStyle-Width="100" >
<ControlStyle Height="100px" Width="100px"></ControlStyle>
</asp:ImageField>
Complete
HTML Markup of webform:
<head runat="server">
<title>Replace null or empty
value with default message </title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" OnRowDataBound="GridView1_RowDataBound1">
<Columns>
<asp:BoundField HeaderText="Name" DataField="Name" NullDisplayText="-NA-">
<HeaderStyle HorizontalAlign="Left" />
</asp:BoundField>
<asp:BoundField DataField="Phone" HeaderText="Phone" NullDisplayText="-NA-">
<HeaderStyle HorizontalAlign="Left" />
</asp:BoundField>
<asp:BoundField DataField="Salary" HeaderText="Salary" NullDisplayText="-NA-">
<HeaderStyle HorizontalAlign="Left" />
</asp:BoundField>
<asp:BoundField DataField="Department" HeaderText="Department" NullDisplayText="-NA-">
<HeaderStyle HorizontalAlign="Left" />
</asp:BoundField>
<asp:TemplateField HeaderText="Email">
<ItemTemplate>
<asp:Label ID="lblemail" runat="server" Text='<%# Eval("EmailId").ToString()==""?"-NA-" :Eval("EmailId") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:ImageField DataImageUrlField="ImagePath" NullImageUrl="~/images/img-not-available.jpg" ControlStyle-Height="100" ControlStyle-Width="100" >
<ControlStyle Height="100px" Width="100px"></ControlStyle>
</asp:ImageField>
</Columns>
</asp:GridView>
</div>
</div>
</form>
</body>
</html>
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