Hide the control if value of a column is empty in a gridview

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I have bind the job list in my gridview. job title,job location,contactmail-these are fields i have bind in the gridview....If the contactmail is null or empty then apply image button must be hide for that particular job... How can i do that....

ASPX PAGE :

<asp:GridView ID="GridView1" GridLines="None" BorderStyle="None" runat="server" Width="100%" AutoGenerateColumns="False"
onpageindexchanging="GridView1_PageIndexChanging" AllowPaging="True" PageSize="20" OnRowDataBound="GridView1_RowDataBound" >
<columns>
<asp:TemplateField ControlStyle-BorderStyle="None">
<itemtemplate>

<%# Eval("Walkin_Title") %>--Exp.[<%#Eval("Exp")%>]

<%#Eval("Company_Name")%>
Skills :<%#Eval("Skills")%>

Job Location :<%# Eval("LocationName")%>		<asp:ImageButton ID="ImageButton1" OnClick="ImageButton1_Click" CommandArgument='<%# Eval("WalkinID")%>' ImageUrl="~/images/apply.png" runat="server" />
<asp:Label ID="maillbl" runat="server" Text='<%# Eval("ContactMail")%>' >
<asp:Label ID="resltlbl" runat="server" Text="Label" Visible="False" CssClass="Confirm_Msg">

<pagersettings firstpagetext="" lastpagetext="">
Mode="NextPreviousFirstLast" NextPageText=""
PreviousPageText="Previous" FirstPageImageUrl="~/images/First_arrow.png"
LastPageImageUrl="~/images/Last_Arrow.png"
NextPageImageUrl="~/images/Next_arrow.png"
PreviousPageImageUrl="~/images/previous_arrow.png" />
<pagerstyle horizontalalign="Center" verticalalign="Bottom">

Posted 4-Sep-13 21:08pm

SnvMohan

Updated 18-Apr-17 1:49am

v2

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Thomas ktg · Answer 1 · 2013-09-04T21:42:00

Hi you can try like this,

ASP.NET

<asp:label id="maillbl" runat="server" visible='<%# Eval("ContactMail").ToString()!=""?true:false %>' text="<%# Eval("ContactMail")%>" xmlns:asp="#unknown">
</asp:label>

To hide the image button 
<asp:ImageButton ID="ImageButton1" Visible='<%# Eval("ContactMail")!=""?true:false %>' OnClick="ImageButton1_Click" CommandArgument='<%# Eval("WalkinID")%>' ImageUrl="~/images/apply.png" runat="server" />