Question

I’m having a bit of trouble figuring this one out.

I have a dropdownlist (populated from a datasource that concatenates first and last names, and the value is an “employee ID”, oh and it’s a sql server database).

I also have a formview, that displays all the “employee” information (same database, different sqldatasource. What I’m trying to do is when a user selects an employee from the dropdownlist, it finds the page with the matching employee ID and displays that page.

The formview also needs to keep the paging, to allow a user to select next or previous if needed. (It’d also be nice if the ddl would update on next and previous to show the current viewed employee).

Currently, I have the ddl inside the formview, with a

SelectedValue='<%# Eval("Employee_ID") %> (which I'm hoping will take care of the ddl showing part, haven't tested that bit as I just woke up,heh).

I have autopostback in the ddl set to true, and it is firing the OnSelectedIndexChanged event, I’m just not sure what to do next. (more specifically, I guess I don’t know how in C# to find the page with the matching “employee id”.

Thanks much for any help!

Answer 1

I think this is big example , how to bind and update the form view using drop down select item….

    <asp: ObjectDataSource ID="ObjectDataSource1" runat="server" DeleteMethod="Delete"
        InsertMethod="Insert" OldValuesParameterFormatString="original_{0}" SelectMethod="GetData"
        TypeName="DataSet1TableAdapters.teachersTableAdapter" UpdateMethod="Update">
     <DeleteParameters>
       <asp: Parameter Name="Original_PKID" Type="Int32" />
    </DeleteParameters>
    <UpdateParameters>
       <asp: Parameter Name="name" Type="String" />
       <asp: Parameter Name="lastname" Type="String" />
       <asp: Parameter Name="department" Type="Int32" />
       <asp: Parameter Name="PKID" Type="Int32" />
    </UpdateParameters>
    <InsertParameters>
         <asp: Parameter Name="name" Type="String" />
         <asp: Parameter Name="lastname" Type="String" />
         <asp: Parameter Name="department" Type="Int32" />
    </InsertParameters>
  </asp: ObjectDataSource>
    <br />

   <asp: ObjectDataSource ID="ObjectDataSource2" runat="server" DeleteMethod="Delete"
    InsertMethod="Insert" OldValuesParameterFormatString="original_{0}" SelectMethod="GetData"
    TypeName="DataSet1TableAdapters.departmentsTableAdapter" UpdateMethod="Update">
    <DeleteParameters>
        <asp: Parameter Name="Original_PKID" Type="Int32" />
    </DeleteParameters>
    <UpdateParameters>
       <asp: Parameter Name="departmentName" Type="String" />
       <asp: Parameter Name="PKID" Type="Int32" />
    </UpdateParameters>
      <InsertParameters>
         <asp: Parameter Name="departmentName" Type="String" />
        </InsertParameters>
      </asp:ObjectDataSource></div><br />

      <asp: FormView ID="FormView1" runat="server" AllowPaging="True" DataKeyNames="PKID"
       DataSourceID="ObjectDataSource1" OnDataBound="FormView1_DataBound">
    <EditItemTemplate>
      PKID:
       <asp: Label ID="PKIDLabel1" runat="server" Text='<%# Eval("PKID") %>'></asp:Label><br />
       name:
        <asp: TextBox ID="nameTextBox" runat="server" Text='<%# Bind("name") %>'>
          </asp: TextBox><br />
        lastname:
       <asp: TextBox ID="lastnameTextBox" runat="server" Text='<%# Bind("lastname") %>'>
    </asp: TextBox><br />
       department:
        <asp: TextBox ID="departmentTextBox" runat="server" Text='<%# Bind("department") %>'>
         </asp:TextBox><br />
       <asp:LinkButton ID="UpdateButton" runat="server" CausesValidation="True" CommandName="Update"
          Text="Update">
      </asp: LinkButton>
         <asp: LinkButton ID="UpdateCancelButton" runat="server" CausesValidation="False"             CommandName="Cancel"
    Text="Cancel">
         </asp: LinkButton>
     </EditItemTemplate>
    <InsertItemTemplate>
    name:
    <asp: TextBox ID="nameTextBox" runat="server" Text='<%# Bind("name") %>'>
    </asp: TextBox><br />
    lastname:
    <asp: TextBox ID="lastnameTextBox" runat="server" Text='<%# Bind("lastname") %>'>
    </asp: TextBox><br />
    department:
    <asp: TextBox ID="departmentTextBox" runat="server" Text='<%# Bind("department") %>'>
    </asp: TextBox><br />
    <asp: LinkButton ID="InsertButton" runat="server" CausesValidation="True" CommandName="Insert"
    Text="Insert">
    </asp: LinkButton>
    <asp: LinkButton ID="InsertCancelButton" runat="server" CausesValidation="False" CommandName="Cancel"
    Text="Cancel">
    </asp: LinkButton>
    </InsertItemTemplate>
    <ItemTemplate>
    PKID:
    <asp: Label ID="PKIDLabel" runat="server" Text='<%# Eval("PKID") %>'></asp:Label><br />
    name:
    <asp: Label ID="nameLabel" runat="server" Text='<%# Bind("name") %>'></asp: Label><br />
    lastname:
    <asp: Label ID="lastnameLabel" runat="server" Text='<%# Bind("lastname") %>'></asp: Label><br />
    department:
    <asp: DropDownList ID="DropDownList1" runat="server" DataSourceID="ObjectDataSource2"
    DataTextField="departmentName" DataValueField="PKID">
    </asp: DropDownList><br />
    <asp: LinkButton ID="EditButton" runat="server" CausesValidation="False" CommandName="Edit"
    Text="Edit"></asp: LinkButton>
    <asp: LinkButton ID="DeleteButton" runat="server" CausesValidation="False" CommandName="Delete"
    Text="Delete"></asp: LinkButton>
    <asp: LinkButton ID="NewButton" runat="server" CausesValidation="False" CommandName="New"
    Text="New"></asp: LinkButton>
    </ItemTemplate>
    </asp: FormView>

In the code behind i used itemdatabound event of the formview so that i set the <strong class="highlight">selected</strong> value for the dropdownlist as follows : 



protected void FormView1_DataBound(object sender, EventArgs e)
{
        DataRowView drv = (DataRowView)FormView1.DataItem;
        ((DropDownList)FormView1.FindControl("DropDownList1")).SelectedValue = drv["department"].ToString();
 }
 protected void FormView1_DataBound(object sender, EventArgs e)
 {
        DataRowView drv = (DataRowView)FormView1.DataItem;
        ((DropDownList)FormView1.FindControl("DropDownList1")).SelectedValue = drv["department"].ToString();
 }