Question

Is it possible? I notice that the Gridview (Visual Studio 2010 Web Application) only contain text field and so was wonder if it is possible to convert or change a text field to a drop down list inside a Gridview.

The text field will appear if you click on the edit field and those text will be store inside a text field.

_{(source: microsoft.com)}

Answer 1

You should add an edit template to your aspx.

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" 
            DataKeyNames="EmployeeID" DataSourceID="SqlDataSource1">
            <Columns>
                <asp:CommandField ShowEditButton="True" />
                <asp:BoundField DataField="EmployeeID" HeaderText="EmployeeID" 
                    InsertVisible="False" ReadOnly="True" SortExpression="EmployeeID" />
                <asp:BoundField DataField="LastName" HeaderText="LastName" 
                    SortExpression="LastName" />
                <asp:BoundField DataField="FirstName" HeaderText="FirstName" 
                    SortExpression="FirstName" />
                <asp:BoundField DataField="HireDate" HeaderText="HireDate" 
                    SortExpression="HireDate" />
                <asp:TemplateField HeaderText="City" SortExpression="City">
                    <EditItemTemplate>
                        <asp:DropDownList ID="DropDownList1" runat="server" 
                            DataSourceID="SqlDataSource2" DataTextField="City" DataValueField="City" 
                            SelectedValue='<%# Bind("City") %>'>
                        </asp:DropDownList>
                    </EditItemTemplate>
                    <ItemTemplate>
                        <asp:Label ID="Label1" runat="server" Text='<%# Bind("City") %>'></asp:Label>
                    </ItemTemplate>
                </asp:TemplateField>
            </Columns>
        </asp:GridView>

Refer to: Walkthrough: Displaying a Drop-Down List While Editing in the GridView Web Server Control