Gridview On Row Command

Question

I'm trying to validate a GridView using its onRowCommand.
When I select a button, it needs to validate that rows delivery date and shows an error message inline if invalid.

Currently, my GridView is setup like this:

 <asp:GridView ID="gvDistribution" runat="server" AutoGenerateColumns="False" CellPadding="4" ForeColor="#333333" GridLines="None" Width="1000px" DataKeyNames="id" AllowPaging="True" OnPageIndexChanging="gvDistribution_PageIndexChanging" PageSize="5" OnRowCommand="gvDistribution_OnRowCommand" OnRowDataBound="gvDistribution_RowDataBound">
       <AlternatingRowStyle BackColor="White" ForeColor="#284775" />
           <Columns>
                <asp:BoundField DataField="name" HeaderText="Beneficiary Name"></asp:BoundField>
                <asp:BoundField DataField="packingDate" HeaderText="Packing Date" DataFormatString="{0:dd/M/yyyy}"></asp:BoundField>
                <asp:BoundField DataField="deliveryDate" HeaderText="Delivery Date" DataFormatString="{0:dd/M/yyyy}" />
                <asp:TemplateField HeaderText="Status" ItemStyle-Width="120px">
                      <ItemTemplate>
                           <asp:Label ID="lblStatus" runat="server"></asp:Label>
                      </ItemTemplate>
                </asp:TemplateField>
                <asp:ButtonField CommandName="View" Text="View Details" />
                <asp:ButtonField CommandName="Action" Text="Action" />
                <asp:TemplateField HeaderText="" ItemStyle-Width="120px">
                   <ItemTemplate>
                         <asp:Label ID="lblError" runat="server"></asp:Label>
                   </ItemTemplate>
                </asp:TemplateField>
           </Columns>
 </asp:GridView>

And the code behind for GridView onRowCommand:

protected void gvDistribution_OnRowCommand(object sender, GridViewCommandEventArgs e)
    {
        int rowNo = int.Parse(e.CommandArgument.ToString());
        string distributionID = this.gvDistribution.DataKeys[rowNo].Value.ToString();
        if (e.CommandName == "View")
        {
            Response.Redirect("PackingDetails.aspx?id=" + distributionID);
        }
        else if(e.CommandName == "Action")
        {
            DistributionPacking distPack = new DistributionPacking();
            distPack = packBLL.getDateDetailByDistributionID(distributionID);
            DateTime deliveryDate = distPack.deliveryDate;

            foreach (GridViewRow g in gvDistribution.Rows)
            {
                if (deliveryDate > DateTime.Today)
                {
                    Label lblError = (Label)g.FindControl("lblError");
                    lblError.Text = "Delivery date has not reach yet!";
                }
                else
                {
                    bool result = packBLL.updateDeliveryStatus(distributionID);
                    if (!result)
                    {
                        //Call the retrieve all distributions without any filtering again
                        List<DistributionPacking> allDistribution = new List<DistributionPacking>();
                        allDistribution = packBLL.getAllDistribution();
                        gvDistribution.DataSource = allDistribution;
                        gvDistribution.DataBind();
                    }
                }
            }
        }
    }

The issue is that when the delivery date gets validated, an error message is displayed in every row, not just the one needing validation.
Could someone show me how to force only one message in the validated row?

Answer 1

Then replace the loop beginning with

foreach (GridViewRow g in gvDistribution.Rows){}

with

if(gvDistribution.SelectedRow != null)
{
    if (deliveryDate > DateTime.Today)
    {
        Label lblError = (Label)gvDistribution.SelectedRow.FindControl("lblError");
        lblError.Text = "Delivery date has not reach yet!";
    }
    else
    {
        // ...
    }
}