Dropdownlist bound null valuee if there is nothing

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So i have question i have dropdownlist in Gridview soo first i need to pass it nothing if someon edit it and gave him value it will update here is code snippet

ASP.NET

<asp:DropDownList runat="server" ID="compn" CssClass="Dropdowni" SelectedValue='<%# Bind("Company_ID") %>'
                            DataSourceID="ObjectDataSource5" DataTextField="Name_Ge" 
            DataValueField="Code5" Enabled="false"
 </asp:DropDownList>

C#

'compn' has a SelectedValue which is invalid because it does not exist in the list of items.
Parameter name: value

here is the error what it is giving mee

What I have tried:

ASP.NET

AppendDataBoundItems="true">
<asp:ListItem Text="Select One" Value=""></asp:ListItem>
</asp:DropDownList>

here is what i have tried but when i go on a edit it is showing me only select one in db i have some records

Posted 6-Mar-16 19:46pm

GTR0123

Updated 6-Mar-16 20:49pm

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Suvendu Shekhar Giri · Accepted Answer · 2016-03-06T20:49:00

You need to remove the ``SelectedValue`` property from the initial load.
Remove following-

HTML

SelectedValue='<%# Bind("Company_ID") %>'

The modified code should looks something like-

ASP.NET

<asp:dropdownlist runat="server" id="compn" cssclass="Dropdowni" datasourceid="ObjectDataSource5" datatextfield="Name_Ge" datavaluefield="Code5" enabled="false" xmlns:asp="#unknown">
</asp:dropdownlist>

Now, if you want something to be selected, you can always do that in code behind.

Hope, it helps :)
Please let me know if you need further guidance on this.