Getting Error while using dropdownlist inside repeater

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I need to visible textbox and label based on the selection of dropdownlist value...

VB

<asp:Repeater ID="RepterDetails" runat="server"
       onitemcommand="RepterDetails_ItemCommand" >
 <ItemTemplate>

<pre> <tr>

    <td width="93" align="left" valign="middle">Marital Status</td>
    <td width="12" align="center" valign="middle">:</td>
        
    <td width="150" align="left" valign="middle"><asp:Label ID="lbl_marital" runat="server" Text='<%# DataBinder.Eval(Container.DataItem, "maritalstatus")%>' Font-Bold="true"></asp:Label>   
  
       <asp:DropDownList ID="marital" runat="server" class="feedback_textfield" Visible ="False" AppendDataBoundItems="true" OnSelectedIndexChanged="marital_SelectedIndexChanged"  AutoPostBack="true"  >
     <%--  <asp:ListItem>Select</asp:ListItem>--%>
     
       <asp:ListItem Value="1" >unmarried</asp:ListItem>
        <asp:ListItem Value="2">married</asp:ListItem></asp:DropDownList></td>   
        </tr>

based on the selection of dropdownlist value inside repeater,
i want to visible/invisible textboxes..

<asp:TextBox ID="txtwife" runat="server" class="feedback_textfield" Text='<%# Bind("wifename")%>'></asp:TextBox>

I have tried like this..


<pre>protected void ddlExtended_SelectedIndexChanged(object sender, EventArgs e)
        {
         DropDownList marital = (DropDownList)RepterDetails.FindControl("marital");

         TextBox txtwife = (TextBox)RepterDetails.FindControl("txtwife");
         if (marital.SelectedValue == "married")
            {
                txtwife.Visible = true;
            }
            else
            {
                txtwife.Visible = false;
            }
        }</pre>

While selecting Dropdown list value, I cant able to use the selected value..
Bcoz Its returning null Value..

Error:Object reference not set to an instance of an object.
its returning null value for

if (marital.SelectedValue == "married")

can anyone suggest me how to access dropdownlist selected value inside repeater..

Thanks in Advance

Posted 22-May-14 23:35pm

priya dharshan

Updated 22-May-14 23:37pm

v2

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Sunasara Imdadhusen 23-May-14 5:51am

I have already given answer of your same question. Please do not post same question again and again.

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PJ003 · Answer 1 · 2014-05-22T23:52:00

try finding the dropdown and textbox in ItemDataBound of your repeater

C#

protected void RepterDetails_ItemDataBound(object sender, RepeaterItemEventArgs e)
{
    if (e.Item.ItemType == ListItemType.Item || 
       e.Item.ItemType == ListItemType.AlternatingItem)
    {
        DropDownList ddl = (DropDownList)e.Item.FindControl("marital");
        TextBox txt = (TextBox)e.Item.FindControl("txtwife");        
        // DO STUFF HERE !!!
    }
}