change value of cell in gridview when in edit mode

Question

I have a grid view with a column:

<asp:BoundField DataField="ClosedDate" HeaderText="ClosedDate" SortExpression="ClosedDate" ReadOnly="True" ItemStyle-Width="11%" />

In gridview edit mode when a value is selected in a dropdown then I want to give this ClosedDate cell a value

I have the following code:

 protected void ddlState_SelectedIndexChanged(object sender, EventArgs e)
        {
            GridViewRow gvr = (GridViewRow)(((Control)sender).NamingContainer);
            DropDownList duty = (DropDownList)gvr.FindControl("ddlState");
            stateValue = duty.SelectedItem.Value;

            if (stateValue == "3")
            {

            }
        }

I only want to update the current edited cell. I am not sure how to do this.

The row has a few columns but closedDate is empty until state = 3 then give the closedDate cell a date a value or now()

Answer 1

you may use asp:TemplateField with a TextBox instead of asp:BoundField . Then in your DropDownlist_selectedIndexChanged update the value of TextBox

<asp:TemplateField HeaderText="ClosedDate" SortExpression="ClosedDate" ItemStyle-Wrap="false">
   <ItemTemplate>
       <asp:Label ID="lblCD" runat="server" Text='<%# Eval("ClosedDate") %>'/>                                            
   </ItemTemplate>
   <EditItemTemplate>
       <asp:TextBox ID="txtCD" runat="server" Text='<%# Bind("ClosedDate") %>'/>
   </EditItemTemplate>                                            
</asp:TemplateField>