Conditionally hide CommandField or ButtonField in Gridview

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First, convert your ButtonField or CommandField to a TemplateField, then bind the Visible property of the button to a method that implements the business logic:

<asp:GridView runat="server" ID="GV1" AutoGenerateColumns="false">
    <Columns>
        <asp:BoundField DataField="Name" HeaderText="Name" />
        <asp:BoundField DataField="Age" HeaderText="Age" />
        <asp:TemplateField>
            <ItemTemplate>
                <asp:Button runat="server" Text="Reject" 
                Visible="<%# IsOverAgeLimit((Decimal)Eval("Age")) %>" 
                CommandName="Select"/>
            </ItemTemplate>
        </asp:TemplateField>
    </Columns>
</asp:GridView>

Then, in the code behind, add in the method:

protected Boolean IsOverAgeLimit(Decimal Age) {
    return Age > 35M;
}

The advantage here is you can test the IsOverAgeLimit method fairly easily.

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