Showing and hiding of gridview button based on the value of a cell in the same row

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ASP.NET

C#3.5

Gridview

I have a gridview in my ASP.NET. in my gridview columns, i want the button on each row to show or hide if the value of a cell is the same cell is empty or null. for example, i want a button to show on each row that has Signout_Time as null or empty. i have written the code below. the issue i'm having is that the codes works in an opposite way. Buttons are showed on the rows with Signout_Time, while the button on rows without a value for Signout_Time visibility becomes false. it shouldnt be so. I have also tried changing my if conditions, it still didnt work

What I have tried:

<asp:GridView ID="GridView1" runat="server" AllowPaging="True" Height="326px" OnPageIndexChanging="GridView1_PageIndexChanging" PageSize="5" style="text-align: left; margin-left: 169px" Width="1069px" OnSelectedIndexChanged="GridView1_SelectedIndexChanged" OnRowDataBound="GridView1_RowDataBound" AutoGenerateColumns="False" OnRowCommand="GridView1_RowCommand" OnRowEditing="GridView1_RowEditing">
                        
                        <Columns>
                            <asp:BoundField HeaderText="S/N" DataField="SN" />
                            <asp:BoundField HeaderText="First Name" DataField="FirstName" />
                            <asp:BoundField HeaderText="Address" DataField="Address" />
                            <asp:BoundField HeaderText="Phone Number" DataField="PhoneNumber" />
                            <asp:BoundField HeaderText="Sex" DataField="Sex" />
                            <asp:BoundField HeaderText="Reason" DataField="Reason" />
                            <asp:BoundField HeaderText="SignIn" DataField="SignIn_Time" />
                            <asp:BoundField HeaderText="SignOut" DataField="Signout_Time" />
                           
                            <asp:TemplateField HeaderText="Action" Visible="True">
                                <ItemTemplate>
                                    <asp:Button ID="out" runat="server" Text="Sign out" CommandName="SignOut"  CommandArgument='<%#Eval("SN") %>'/>
                                </ItemTemplate>
                            </asp:TemplateField>
                        </Columns>
                        
                <PagerSettings FirstPageText="First" LastPageText="Last" Mode="NumericFirstLast" PageButtonCount="5" />
                        
                        
            </asp:GridView>

protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
       {

switch (e.Row.RowType)
{
case DataControlRowType.DataRow:
DataRowView myDataRowView = (DataRowView)e.Row.DataItem;
if (String.IsNullOrEmpty(myDataRowView["Signout_Time"].ToString()))
{
Button status = (Button)e.Row.FindControl("out");
if (status != null)
{
status.Visible = true;
}
}
break;
}

}