Question

UpdateParameter not being passed

Asked by: Bill732

Hello,

I have a details veiw used to update a data through a strongly typed dataset.

At the _ItemUpdating event I remove some parameters so I can add them back in with the selected values from dropdownlists. Then the program continues to the updating method with the new values. Except for just one value, Main_Number in the code below.

The only difference between this parameter and the others is that it will be used in the method as a string while the others will be used as number types (decimal and integer as shown below). If anything thing I would expect the number types to fail but they work just fine.

I'm trying to figure out why just one (Main_Number) is not properly passed to the method like the others. What happens is the original value is passed instead of the changed value.

Thanks very much,
-Bill
 

//code that changes the parameter values:
  {
        //Find dropdown to get selected Item text  
        DropDownList ddlDvCountry = (DropDownList)
        dvParent.FindControl("ddlCountry");
        string strCountry = ddlDvCountry.SelectedItem.Value;
 
        DropDownList ddlDvState = (DropDownList)
        dvParent.FindControl("ddlState");
        string strState = ddlDvState.SelectedItem.Value;
 
        DropDownList ddlIndustry = (DropDownList)
        dvParent.FindControl("ddlIndustry");
        string strIndustry = ddlIndustry.SelectedItem.Value;
 
        DropDownList ddlMainName = (DropDownList)
        dvParent.FindControl("ddlMainName");
        string strMain = ddlMainName.SelectedItem.Value;
 
        odsParentDetail.UpdateParameters.Remove(odsParentDetail.UpdateParameters["countryID"]);
        odsParentDetail.UpdateParameters.Remove(odsParentDetail.UpdateParameters["stateID"]);
        odsParentDetail.UpdateParameters.Remove(odsParentDetail.UpdateParameters["industryID"]);
        odsParentDetail.UpdateParameters.Remove(odsParentDetail.UpdateParameters["Main_Number"]);
        odsParentDetail.UpdateParameters.Add("countryID", strCountry);
        odsParentDetail.UpdateParameters.Add("stateID", strState);
        odsParentDetail.UpdateParameters.Add("industryID", strIndustry);
        odsParentDetail.UpdateParameters.Add("Main_Number", strMain);
        
   //At this point in debug I can see that all paramters are changed - including Main_Number.
 
}
 
//Beginning of the method that uses the parameters. In debug at the point below I can see that all of the values from above are passed correctly to the method except for Main_Number - which is unchanged.   
 
public bool UpdateParentDetail(int Parent_Number, string Parent_Name, int industryID, decimal countryID, decimal stateID, string Main_Number)
     {
         //do stuff
}

                                  
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Asked On
2009-09-16 at 15:12:53ID24738151
Tags

asp.net

,

C#

Topics

Programming for ASP.NET

,

C# Programming Language

Participating Experts
1
Points
500
Comments
7

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Answers

 

by: Bill732Posted on 2009-09-16 at 15:21:34ID: 25350863

Not that it's relevant, but I missed copying the _ItemUpdating method header into the code snippet above (top method in snippet above):

    protected void dvParent_ItemUpdating(object sender, DetailsViewUpdateEventArgs e)

Sorry

 

by: Priest04Posted on 2009-09-18 at 13:25:01ID: 25369677

Have you tried explicitly deckaring type of the Main_Number parameter?

odsParentDetail.UpdateParameters.Add("Main_Number", SqlDbType.VarChar); // replace VarChar with correct data type
odsParentDetail.UpdateParameters["Main_Number"].Value = strMain;

                                              
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by: Bill732Posted on 2009-09-21 at 06:10:43ID: 25382457

When I tried using SqlDbType.VarChar it invalid, so I tried:

odsParentDetail.UpdateParameters.Add("Main_Number", TypeCode.String, strMainClient);

this ran fine, but unfortunately did not solve the issue. I'm glad to know about being able to explicitly declare the the types - thanks!

 

by: Bill732Posted on 2009-09-21 at 06:20:23ID: 25382523

I just realized that I missed adding part of your recommendation. It flagged it as invalid (maybe that is another clue to the issue I'm having?). So, I needed to write it like this:

odsParentDetail.UpdateParameters.Add("Main_Number", TypeCode.String, strMain);
        odsParentDetail.UpdateParameters["Main_Number"].DefaultValue = strMain;

"Value" was not in the intellisense, but DefaultValue was. I wonder if that means I'm missing one of the "using .." statements that I need.

 

by: Bill732Posted on 2009-09-21 at 06:46:01ID: 25382754

I think the problem may be caused by the page code below.

I have a dropdown list where the user selects "Main" by Name, then the Number is passed as the parameter, at least that is what I want to accomplish.

But, I also have a label in the Edit template that shows the selected Number using javascript. I think maybe the Bind in that label prevents my code from using the selected ddl parameter.

Not yet sure how to modify to get around it...

<asp:DropDownList ID="ddlMainName" runat="server" 
                            DataSourceID="odsMain"
                            DataTextField="MAIN_NAME" DataValueField="MAIN_NUMBER"
                            SelectedValue='<%# Session["MAIN_NUMBER"].ToString() %>'
                            onchange="getMainSelectedValue()"
                             >
                        </asp:DropDownList>
                        <asp:ObjectDataSource ID="odsMain" runat="server" 
                            OldValuesParameterFormatString="original_{0}" 
                            SelectMethod="GetMainNames" TypeName="PopulateDropDownsBLL"
                             >
                            <SelectParameters>
                                <asp:ControlParameter ControlID="dvParent" Name="PARENT_NUMBER" 
                                    PropertyName="SelectedValue" Type="Int32" />
                            </SelectParameters>
                        </asp:ObjectDataSource>
                    </EditItemTemplate>
                </asp:TemplateField>
                <asp:TemplateField HeaderText="Main Number" 
                    SortExpression="Main Number">
                    <ItemTemplate>
                        <asp:Label ID="Label2" runat="server" Text='<%# Bind("Main_Number") %>'></asp:Label>
                    </ItemTemplate>
                    <EditItemTemplate>
                        <asp:Label ID="lblMainNumber" runat="server" Text='<%# Bind("Main_Number") %>'></asp:Label>
                    </EditItemTemplate>
                    <InsertItemTemplate>
                        <asp:TextBox ID="TextBox8" runat="server" 
                            Text='<%# Bind("Main_Number") %>'></asp:TextBox>
                    </InsertItemTemplate>
                </asp:TemplateField>

                                              
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by: Bill732Posted on 2009-09-21 at 06:51:38ID: 25382808

Yes, that is the problem. if I change this:

<EditItemTemplate>
                        <asp:Label ID="lblMainNumber" runat="server" Text='<%# Bind("Main_Number") %>'></asp:Label>
                    </EditItemTemplate>


to this:

<EditItemTemplate>
                        <asp:Label ID="lblMainNumber" runat="server" Text=''></asp:Label>
                    </EditItemTemplate>

The parameter from the ddl is passed as desired. I would like to show the Number in that label when the page loads if possible. As of the edit above it will show the number after the user selects. So, I need a way other than Bind.

 

by: Bill732Posted on 2009-09-21 at 06:56:29ID: 25382841

Actually I meant to say I would like to show the Number in the label when the details view is shown (appears in edit mode) - not when the page loads. I believe need a different approach than using Bind.

20120131-EE-VQP-002

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