Retrieving value from DDL for Code Behind in ASP.Net

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Trying to pull a value out of a Drop Down List on my ASP page.

Here is the markup for the page itself:

ASP.NET

<asp:DropDownList ID="ddlCurrentIncidentStatus" runat="server" Height="37px" SelectedValue='<%# Bind("Current_Incident_Status") %>' Width="347px">
                                    <asp:ListItem>Please select one...</asp:ListItem>
                                    <asp:ListItem>Contained</asp:ListItem>
                                    <asp:ListItem>Uncontained</asp:ListItem>
                                    <asp:ListItem>Investigating</asp:ListItem>
                                    <asp:ListItem>Other (Explained in Incident Description)</asp:ListItem>
                                </asp:DropDownList>

Here is the Code Behind for the control:

C#

DropDownList CurrentIncidentStatus = (DropDownList)FormView1.FindControl("ddlCurrentIncidentStatus");
                string currentIncidentStatus = CurrentIncidentStatus.Text.ToString();

I'm getting this error:

Unable to cast object of type 'System.Web.UI.WebControls.DropDownList' to type 'System.Web.UI.WebControls.TextBox'

Posted 25-Jun-14 5:04am

Branden Coker

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hypermellow · Accepted Answer · 2014-06-25T05:19:00

Solution 1

Hi,

I don't think a DropDownList has a Text property, modify it to SelectedValue as per below.

C#

DropDownList CurrentIncidentStatus = (DropDownList)FormView1.FindControl("ddlCurrentIncidentStatus");
string currentIncidentStatus = CurrentIncidentStatus.SelectedValue;

Hope it helps.

Posted 25-Jun-14 5:19am

hypermellow

Comments

DamithSL 25-Jun-14 11:51am

this is not the reason for the error. All List controls having Text property. check the documentation

DamithSL · Accepted Answer · 2014-06-25T05:49:00

(DropDownList)FormView1.FindControl("ddlCurrentIncidentStatus"); will not throw

Quote:
Unable to cast object of type 'System.Web.UI.WebControls.DropDownList' to type 'System.Web.UI.WebControls.TextBox'

Error is on some other code, check all placess where you find controls and casting. for example, you may have search for DropDownList and casting to TextBox like (TextBox)FormView1.FindControl("ddl....
Find and correct the costing.