dynamically hiding linkbuttons in a gridview - asp.net

Question

Here is my template field with 2linkbuttons in a gridview.
How do I hide one of the lnkbuttons depending on the user selection
<asp:TemplateField HeaderText="Action">
<ItemTemplate>
<table>
<tr>
<td align="center">
<asp:LinkButton ID="LinkButton1" runat="server" CommandName= "Publish" CommandArgument="<%# Container.DataItemIndex %>"></asp:LinkButton>
</td>
<<td align="center">
<asp:LinkButton ID="LinkButton2" runat="server" CommandName= "Block" HeaderText="Block" CommandArgument="<%# Container.DataItemIndex %>">Block</asp:LinkButton>
</td>
</tr>
</table>
</ItemTemplate>
</asp:TemplateField>
protected void GridView1_OnRowDataBound(object sender, GridViewRowEventArgs e)
{
if(Status=="Posted")
{
LinkButton lbtn2 = (LinkButton)e.Row.FindControl("LinkButton2");
lbtn2.Visible = false;
}
if(Status=="Publish")
{
LinkButton lbtn1 = (LinkButton)e.Row.FindControl("LinkButton1");
lbtn1.Visible = false;
}
}
I am doing this using 2 linkbuttons in the template field.
Here if the Status == Posted, then hide LinkButton2.
If ItemType == Published, then hide LinkButton1.
I don't mind using only Linkbutton and set the commandName and commandArgument in aspx.cs`
I am getting an error at...
LinkButton lbtn2 = (LinkButton)e.Row.FindControl("LinkButton2");
lbtn2.Visible = false;
Error: Object reference not set to an instance pointing to lnbt2.Visible = false;
Any clues,
Thanks
Sun

Answer 1

Check to be sure that the row in question is a data row, not a header, etc. The issue is probably because the current row is a header or footer, so it doesn't contain your controls and throws an exception.
protected void GridView1_OnRowDataBound(object sender, GridViewRowEventArgs e)
{
if(e.Row.RowType == DataControlRowType.DataRow)
{
if(Status=="Posted")
{
LinkButton lbtn2 = (LinkButton)e.Row.FindControl("LinkButton2");
lbtn2.Visible = false;
}
if(Status=="Publish")
{
LinkButton lbtn1 = (LinkButton)e.Row.FindControl("LinkButton1");
lbtn1.Visible = false;
}
}
}

Answer 2

I know this is old but I was looking for the same thing; I was able to do it this way also and posting just for reference:
This is in a listview but should be same for gridview:
<asp:LinkButton ID="btnForms" runat="server" Text='MyButton' CommandName="MyCommandName"
Style='<%#GetHiddenTag(Eval("Status").ToString())%>' CommandArgument='<%#Eval("Status")%>' OnClick="MyOnClickCodeBehind" />
Codebehind:
public string GetHiddenTag(string Status)
{
if (Status.ToLower() == "completed")
return "visibility:hidden;";
return "visibility:visible;";
}