How to disable "Edit" button in Gridview?

Question

Iam using Item Template field in my gridview to update the values inside particular column. The ItemTemplate field contains "label" control and EditItemTemplate contains "DropDownList". Now the problem is I need to disable the "Edit" button based on the value of "Label"... Attached the lines of coding. Can anyone give me a solution.

Home.Aspx:
**********
   <Columns>

                    <asp:BoundField DataField="Date" HeaderText="Date" ReadOnly="true" />
                    <asp:BoundField DataField="Type" HeaderText="Type" ReadOnly="true" />
                    <asp:BoundField DataField="Reason" HeaderText="Reason" ReadOnly="true" />
                    <asp:BoundField DataField="Request By" HeaderText="Request By" ReadOnly="true" />
                    <asp:TemplateField HeaderText="Status" HeaderStyle-HorizontalAlign="center">
                        <EditItemTemplate>
                            <asp:DropDownList ID="ddlState" AutoPostBack="false" runat="server">
                                <asp:ListItem Text="Approved" Value="Approved">  </asp:ListItem>
                                <asp:ListItem Text="Declined" Value="Declined">  </asp:ListItem>
                                <asp:ListItem Text="Pending" Value="Pending">  </asp:ListItem>
                            </asp:DropDownList>
                        </EditItemTemplate>
                        <ItemTemplate>
                            <asp:Label ID="lblName" runat="server" Text='<%# Bind("Status") %>'></asp:Label>
                        </ItemTemplate>
                        <HeaderStyle HorizontalAlign="Center"></HeaderStyle>
                    </asp:TemplateField>
                    <asp:CommandField ShowEditButton="True" />
                </Columns>

Here in my coding "lblName" has the status value in ItemTemplate and "ddlState" has the status value in EditItemTemplate. Based upon the "lblName" value , "Edit" option has to be enabled...

Answer 1

Convert your Edit CommandField to a TemplateField.

In the newly-generated Button, add the following markup:

Enabled='<%# IsEditEnabled(Eval("Status")) %>'

In your code-behind, create a new method:

protected bool IsEditEnabled(string statusValue)
{
    // Here is where you determine the value
}

Let me know how that works for you.

Answer 2

Another approach is to use RowDataBound so you can use the value of Status directly. This assumes you are using a DataTable or other DataRow collection for your data source. The DataItem cast will need to be updated if you are using a different data type.

<asp:GridView ID="ExampleGridView" runat="server" OnRowDataBound="ExampleGridView_RowDataBound">
    <Columns>
        <asp:TemplateField HeaderText="Status" HeaderStyle-HorizontalAlign="center">
            <EditItemTemplate>
                <asp:DropDownList ID="StateDropDownList" AutoPostBack="false" runat="server">
                    <asp:ListItem Text="Approved" Value="Approved" />
                    <asp:ListItem Text="Declined" Value="Declined" />
                    <asp:ListItem Text="Pending" Value="Pending" />
                </asp:DropDownList>
            </EditItemTemplate>
            <ItemTemplate>
                <asp:Label ID="NameLabel" runat="server" Text='<%# Bind("Status") %>' />
            </ItemTemplate>
        </asp:TemplateField>
        <asp:CommandField ShowEditButton="True" />
        <asp:TemplateField ShowHeader="False">
            <ItemTemplate>
                <asp:LinkButton ID="EditButton" runat="server" CommandName="Edit" Text="Edit" Visible="true" />
            </ItemTemplate>
            <EditItemTemplate>
                <asp:LinkButton ID="UpdateButton" runat="server" CommandName="Update" Text="Update" />
                <asp:LinkButton ID="CancelButton" runat="server" CommandName="Cancel" Text="Cancel" />
            </EditItemTemplate>
        </asp:TemplateField>
    </Columns>
</asp:GridView>

From code behind you can handle the row independently and have access to most of what is going on:

protected void ExampleGridView_RowDataBound(Object sender, GridViewRowEventArgs e)
{
    if (e.Row.RowType == DataControlRowType.DataRow 
        && (
            e.Row.RowState == DataControlRowState.Alternate
            || e.Row.RowState == DataControlRowState.Normal
            || e.Row.RowState == DataControlRowState.Selected
        ))
    {
        Button EditButton = (Button)e.Row.FindControl("EditButton");
        System.Data.DataRow dataRecord = (System.Data.DataRow)e.Row.DataItem;
        if (EditButton != null && dataRecord != null)
        {
            if (dataRecord["Status"] == "ValueThatShowsEditButton")
            {
                EditButton.Visible = true;
            }
        }
    }
}