Archive for July, 2012

‘Form’ is an ambiguous reference between ‘System.Windows.Forms.Form’ and ‘Microsoft.SharePoint.Client.Form’ – SharePoint 2010 Client Object Model

When you try to use the Client Object Model (SharePoint 2010) with Windows Application in Visual Studio 2010, you might be getting these error messages. (You can find the step by step instructions to use the SharePoint 2010 Client Object Model here)

Error Message:

'Form' is an ambiguous reference between 'System.Windows.Forms.Form' and 'Microsoft.SharePoint.Client.Form'

Reason: The reason is obvious and we can get from the error message itself. Yes, after added the  SharePoint Client reference to the code, there is a conflict between ‘System.Windows.Forms.Form’ and ‘Microsoft.SharePoint.Client.Form’! Initially our Form1 class inherits from Form class (by default System.Windows.Forms.Form) and currently our program confuses to choose the correct reference.

Solution: Provide full reference to the Form class will be the solution for this issue, so replace ‘Form‘ with ‘System.Windows.Forms.Form
After Replacing the code:

public partial class Form1 : System.Windows.Forms.Form
 public Form1()

That’s all guys, Happy Programming with Client Object Model.

Thanks, R../


The type or namespace name ‘SharePoint’ does not exist in the namespace ‘Microsoft’ (are you missing an assembly reference?) – SharePoint 2010 Client Object Model dlls

When I started using the Client Object model (Client OM) in SharePoint 2010, I have got this simple error and I just want to share with you in this blog. Following was my develpment environment.

  • Windows 7, 64 bit
  • Console Application Visual Studio 2010
  • Added Client Object Model references (Microsoft.SharePoint.Client.dll & Microsoft.SharePoint.Client.Runtime.dll) to the solution

After setting up all the above, I was trying to add the client reference to the code ‘using Microsoft.SharePoint.Client;‘and then I have got the following error and warnings 🙂

The text format of error is:

"The type or namespace name 'SharePoint' does not exist in the namespace 'Microsoft' (are you missing an assembly reference?)"

It’s an obvious error message and the reason of this error is:

SharePoint 2010 does not support .Net 4.0 in default and Visual Studio 2010 default framework is .Net 4.0.

Here are the simple steps to fix this:

Step 1: Right click on the project –> Properties

Step 2: Change the Target framework –> .Net Framework 3.5

Step 3: Warning message will be popping up, click Yes.

That’s all. Happy Coding..!

Please Note: If you use Windows Application then you will be getting an other error message! 😦 To solve this issue just click here.

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Getting started with Silverlight – Visual Studio 2010

Actually this is  my first Silverlight application development, I didn’t get any chance to work with Silverlight in a real time project, so I just wanted to try an application with Silverlight in Visual Studio 2010. It is pretty simple like windows application. 🙂

This is my environment: Visual Studio 2010, Silverlight 4 developer edition and Windows 7.

When I tried to create an application, I have got few version conflict problems and I resolved them. You can see in my previous post if you need. Okay.. we will see the steps.

Step 1: Open the Visual Studio and click New Project

Step 2: Choose the programming language and select Silverlight node in the left pane.

Step 3:  Select the Silverlight application on the middle pane and enter the application name on the Textbox then click ok. 

Step 4: You will be getting the following screen.

Please Note: If you want to enable the WCF RIA Services to access the external data using this application then click the check box. I don’t want to do any, so I just click ok.

Step 5: Here is our solution explorer. If you want to learn about the files and other stuffs just click here and learn more.

Step 6: Just click on the Toolbox on the left side vertical tab (If not shown just click View –> Toolbox OR Ctrl+W, X) and drag and drop the button.

Step 7: Modify the button properties (You can either modify in the property tab on the right side (as usual we do) OR you can modify in the XAML pane).

I have given the button Name=”buttonClick”, Content=”Click”, Height=”50″ and Width=”100″

Step 8: Like button add TextBox and a Label as well. So our design will be displaying like this.

and the XAML:

<Grid x:Name="LayoutRoot" Background="White">
 <Button Content="Click" Height="50" HorizontalAlignment="Left" Margin="152,133,0,0" Name="buttonClick" VerticalAlignment="Top" Width="100" />
 <TextBox Height="25" HorizontalAlignment="Left" Margin="85,70,0,0" Name="textBoxEnter" VerticalAlignment="Top" Width="230" />
 <TextBlock Height="25" HorizontalAlignment="Left" Margin="85,101,0,0" Name="textBlockDisplay" Text="" VerticalAlignment="Top" Width="230" />

Step 9: Double click on the Button to create the click event (You can do this on the right side event tab also) and then write the c# code to getting the string form TextBox and displaying on the Label.

private void buttonClick_Click(object sender, RoutedEventArgs e)
 textBlockDisplay.Text = "Hello " + textBoxEnter.Text;
 buttonClick.Content = "Clicked";

Step 10: That’s all guys, just click the run button (F5) to see our 1st Silverlight application. 🙂

Happy Silverlighing..! We will see the database access later! 🙂

Thanks R./

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