error in asp.net "DropDownList1' has a SelectedValue which is invalid ...

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Hi I have a web site in vs 2010 asp.net in my form there are a gridview and a sqldatasource and my code is :
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="employeeid" SortExpression="employeeid">
<EditItemTemplate>
<asp:TextBox ID="TextBox1" runat="server" Text='<%# Bind("employeeid") %>'></asp:TextBox>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="Label1" runat="server" Text='<%# Bind("employeeid") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="name" SortExpression="name">
<EditItemTemplate>
<asp:TextBox ID="TextBox2" runat="server" Text='<%# Bind("name") %>'></asp:TextBox>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="Label2" runat="server" Text='<%# Bind("name") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="gender" SortExpression="gender">
<EditItemTemplate>
<asp:DropDownList ID="DropDownList1" runat="server" SelectedValue='<%# Bind("gender") %>'>
<asp:listitem>gender</asp:listitem>
<asp:listitem>male</asp:listitem>
<asp:listitem>female</asp:listitem>
</asp:DropDownList>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="Label3" runat="server" Text='<%# Bind("gender") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="city" SortExpression="city">
<EditItemTemplate>
<asp:TextBox ID="TextBox4" runat="server" Text='<%# Bind("city") %>'></asp:TextBox>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="Label4" runat="server" Text='<%# Bind("city") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>

Posted 29-Sep-15 6:31am

rezaeti

Updated 29-Sep-15 6:33am

v2

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rezaeti 29-Sep-15 12:36pm

when i click on edit button on gridview following error shown how to solve error?
'DropDownList1' has a SelectedValue which is invalid because it does not exist in the list of items.
Parameter name: value

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Manas_Kumar · Accepted Answer · 2015-09-29T07:46:00

The SelectedValue property's value is not found in your listitem. Suppose you are getting selected value "10" but that is not present in your dropdownlist item. So you are getting exception. Whatever you are putting value as SelectedValue property that must be present in your dropdownlist Item.

Try code like below:

ASP.NET

<asp:dropdownlist id="DropDownList1" runat="server" selectedvalue="<%# Bind("gender") %>" xmlns:asp="#unknown">	
	<asp:listitem text="gender" value="0"></asp:listitem>
	<asp:listitem text="male" value="1"></asp:listitem>
	<asp:listitem text="female" value="2"></asp:listitem>
</asp:dropdownlist>

Here I used value as 0,1,2 - you need to change what ever you are getting from "gender" column data.