Getting Error while using dropdownlist inside repeater

Question

1.00/5 (1 vote)

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

XML

<asp:Repeater ID="RepterDetails" runat="server"
       onitemcommand="RepterDetails_ItemCommand">
<ItemTemplate>
 <asp:DropDownList ID="marital" runat="server" class="feedback_textfield"   AutoPostBack="true" OnSelectedIndexChanged="ddlExtended_SelectedIndexChanged">
     <%--  <asp:ListItem>Select</asp:ListItem>--%>
        <asp:ListItem>unmarried</asp:ListItem>
        <asp:ListItem>married</asp:ListItem></asp:DropDownList>

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

XML

<td width="93" align="left" valign="middle"><asp:Label ID="lblwife" runat="server" Text="Wife Name" ></asp:Label></td>
    <td width="12" align="center" valign="middle"><asp:Label ID="Label2" runat="server" Text=":" ></asp:Label></td>
    <td width="150" align="left" valign="middle"><asp:Label ID="lbl_wife" runat="server" Text='<%# Bind("wifename")%>' Font-Bold="true"></asp:Label>
        <asp:TextBox ID="txtwife" runat="server" class="feedback_textfield" Text='<%# Bind("wifename")%>' Visible="false"></asp:TextBox></td>
    </tr>

I have tried like this..

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;
            }
        }

protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
BindRepeater();
}
 
}
 
private void BindRepeater()
{
SqlConnection SqlCnn = new SqlConnection(s1);
SqlCommand SqlCmd = new SqlCommand("select * from registration", SqlCnn);
SqlDataAdapter SqlAd1 = new SqlDataAdapter(SqlCmd);
DataSet ds = new DataSet();
SqlAd1.Fill(ds, "registration");
RepterDetails.DataSource = ds;
RepterDetails.DataBind();
}

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.

if (marital.SelectedValue == "married")

..

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

Thanks in Advance

Posted 22-May-14 0:50am

priya dharshan

Updated 22-May-14 23:48pm

Sunasara Imdadhusen

v3

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Comments

Sunasara Imdadhusen 22-May-14 8:39am

@Priya, can you please provide code snippet of Page_Load()

Sunasara Imdadhusen 23-May-14 5:48am

please use Improve Question link to add or update with code, do not past code in comment area.

2 solutions

Solution 1

Hello Priya,

Can you please try this solution.

C#

protected void ddlExtended_SelectedIndexChanged(object sender, EventArgs e) {
 DropDownList MyDropDown= (DropDownList)sender;
 string txtwife = MyDropDown.SelectedValue;
}

Posted 22-May-14 23:44pm

Sunasara Imdadhusen

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priya dharshan · Accepted Answer · 2014-05-25T23:54:00

protected void ddlExtended_SelectedIndexChanged(object sender, EventArgs e)
    {
        foreach (RepeaterItem item in RepterDetails.Items)
        {
            
            DropDownList drp = item.FindControl("marital") as DropDownList;
            TextBox txtwife = item.FindControl("txtwife") as TextBox;
            
            string wife = drp.SelectedValue;
            if (wife == "unmarried")
            {
                txtwife.Visible = false;
            }
            else
            {
                txtwife.Visible = true;
            }
        }
    }