how to prevent duplicate entry from combobox in gridview itemtemplate

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how to prevent duplicate entry from combobox in gridview itemtemplate which is first column of gridview? how i can check already selection has done from combobobox?

ASP.NET

<asp:TemplateField HeaderText="Item" ItemStyle-Height ="10px">
                                                                    <ItemTemplate>
                                                                        <asp:ComboBox ID="cbaccount" runat="server" DataSourceID="SqlDataSource5" DataTextField="itemname" AutoPostBack="true" onkeyup=" UnHighlight(this)"
                                                                            DataValueField="itemid" Width="180px" AutoCompleteMode="SuggestAppend" CssClass="WindowsStyle cb" DropDownStyle="DropDownList" AppendDataBoundItems="True" OnSelectedIndexChanged="cbaccount_SelectedIndexChanged" >
                                                                          <asp:ListItem Selected="True" Text=""></asp:ListItem>
                                                                        </asp:ComboBox>
                                                                         <asp:SqlDataSource ID="SqlDataSource5" runat="server" ConnectionString="<%$ ConnectionStrings:ConnectionASPX %>"
                                                                               SelectCommand="SELECT  [itemname],[itemid] FROM [itemadd]  ORDER BY [itemname]">

                                                                         </asp:SqlDataSource>

                                                                    </ItemTemplate>
                                                                        <HeaderStyle HorizontalAlign="Left" CssClass="HeaderStyle1"  />
                                                                            <ItemStyle Width="180px"  />

                                                            </asp:TemplateField>

Posted 13-Aug-12 23:38pm

veenusethi

Updated 13-Aug-12 23:47pm

Malli_S

v2

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Kuthuparakkal · Answer 1 · 2012-08-14T19:37:00

Solution 1

Change your SELECT as :

SelectCommand="SELECT DISTINCT [itemname],[itemid] FROM [itemadd] ORDER BY [itemname]">

Posted 14-Aug-12 19:37pm

Kuthuparakkal

Comments

veenusethi 16-Aug-12 4:42am

No sir, in combobox itemname is a unique. i dont want any duplicasy in dynamic gridview ? if user select item name for first time i do not want user select that item again in gridview?