ASP.NET Trying to add css class to tr in codebehind - asp.net

Question

So i have the following method
protected void isDirector_CheckedChanged(object sender, EventArgs e)
{
HtmlTableRow row = (HtmlTableRow)e.Item.FindControl("today");
But getting error
CS0117: 'System.EventArgs' does not contain a definition for 'Item'
EDIT :
<asp:UpdatePanel ID="UpdatePanel2"
runat="server"
UpdateMode="Conditional">
<ContentTemplate>
<asp:RadioButtonList ID="isDirector" RepeatDirection="Horizontal" runat="server" AutoPostBack="True" OnSelectedIndexChanged="isDirector_CheckedChanged">
<asp:ListItem Text="Yes" Value="True" selected></asp:ListItem>
<asp:ListItem Text="No" Value="False"></asp:ListItem>
</asp:RadioButtonList>
</ContentTemplate>
</asp:UpdatePanel>
<asp:UpdatePanel
<ContentTemplate>
<tr runat="server" id="test">
<td>Director First Name:</td>
<td><asp:TextBox ID="DirectorfirstNametxt" runat="server" MaxLength="100" CssClass="input"></asp:TextBox>
<asp:RequiredFieldValidator ID="RequiredFieldValidator5" Display="None" runat="server"
ErrorMessage="Director First Name is required." ControlToValidate="DirectorfirstNametxt"></asp:RequiredFieldValidator>
</td>
</tr>
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="isDirector" EventName="SelectedIndexChanged" />
</Triggers>
I am trying to change the CSS CLASS of TR ID = "test"

Answer 1

Assuming you have your Checkboxes inside of a HTML-TableRow and you want to set the CSS-Class of the TR in the CheckedChanged-Event:
This is an example(note that the TR's have a runat="server"-tag):
<table>
<tr ID="TR1" runat="server">
<td>
<asp:CheckBox ID="CheckBox1" OnCheckedChanged="isDirector_CheckedChanged" AutoPostBack="true" runat="server" />
</td>
</tr>
<tr ID="TR2" runat="server">
<td>
<asp:CheckBox ID="CheckBox2" OnCheckedChanged="isDirector_CheckedChanged" AutoPostBack="true" runat="server" />
</td>
</tr>
<tr ID="test" runat="server">
<td>
<asp:CheckBox ID="CheckBox3" OnCheckedChanged="isDirector_CheckedChanged" AutoPostBack="true" runat="server" />
</td>
</tr>
</table>
and this is the codebehind:
protected void isDirector_CheckedChanged(object sender, EventArgs e)
{
//var row = (HtmlTableRow)((CheckBox)sender).Parent.Parent;
test.Attributes("class") = "CssClass";
}
Edit: if your tr's are runat="server" and they have unique ID's, you can access them directly

Answer 2

What kind of control is isDirector_CheckChanged tied to - a checkbox?
As the error says, EventArgs is the type of event you're expecting and it doesn't have an 'Item' property. Maybe you're thinking of GridView, Repeater, or other 'item-like' controls?
I'm guessing you're trying to handle the changed event of a checkbox you've put in a repeating/table control. If so, you'll need to handle a Selected or similar event for the repeater that DOES use an EventArgs-derived type with an Item property.