Hi All,

currently i am designing a usercontrol which inherits from a datagridview, in order to increase itsfunctionality. Basically, I would like to have some defined methods that I continuously use in projects when using the datagridview control.

the problems that till now I am encountering are 2:

1. in the user control designer, this error is being popped out:

The type 'System.Windows.Forms.DataGridView' has no property named 'AutoScaleMode'.

although I have defined this property, as shown below:

AutoScaleMode autoScaleMode;

public AutoScaleMode AutoScaleMode

{

get

{

return autoScaleMode;

}

set

{

autoScaleMode = value;

}

}

1. The error suggests that you are attempting to set the AutoScaleMode of the DataGridView inside your control, rather than of your control itself, which is the object on which you have defined that property. You haven't added AutoScaleMode to System.Windows.Forms.DataGridView, you've created a new type (something like MyProject.MyCustomControlClass) that inherits from DataGridView, and then added a property to THAT type.

2. If initialize component is setting the value to false, set the value to true after InilializeComponent() in the constructor.

Hi JayStation3,

thanks for your reply.

Regarding 1, if I am inheriting from DataGridView, then its base class must have declared the AutoScaleMode as can be found from its properties. So why it keeps showing me that the property is not defined?

Regarding 2, I did know this solution, but i wanted to make it in a professional way instead of manually declaring it to true everytime I use the control.....Maybe in future I forget that in order for my control to work, I need to manually define the property as true. Hence I need something which automatically always defines it to true. Do you understand what I mean since my english is not very well

Thanks for your suggestions

1) I don't think that the base DataGridView class has an AutoScaleMode property. You have defined it in your own class, right? So, you shouldn't have a DataGridView on your form, you have your own custom control, which does have an AutoScaleMode property. Creating a property in the inherited class does not add that property to the base class.

2) You know, I'm not 100 percent certain of the best way to do this -- I might try setting the value in the designer file. You're right, that you should not set the value every time in the form's code.

With respect to theAutoScaleProperty, yheee...you are right, the datagridview does not implement the AutoScaleMode property. So how can I eliminate this error?

Thanks for your suggestion regarding the automatic set of a property, but as I said before, I would like it to be implemented automatically. Does anyone else have any idea how I can manage to always set a property to a default value as explained before?

thanks everyone

You need to set the property value in the custom control. Regular .NET controls have default values for their properties, but that still has to be explicitly set in the code somewhere. If you set it properly in the the definition of the control, then every time you add the control to your form, you will get that value "automatically."

Let's say your class iscalled myControl, and the property is myProperty, a boolean.

You should have a Private variable that holds the myProperty value -- let's call it myPropertyValue.

Now, when you Get() myProperty, you return myPropertyValue.

When you Set() myProperty, you set myPropertyValue == value

If you have never Set() myProperty, then when you Get() it (which includes when the control is initialized), it is going to return False.

So, when you first declare that class variable, myPropertyValue, you can assign it a value of True.

Now, unless you change it explicitly by Set(), myProperty will return True by default every time.

Build it, drag it from the ToolBox onto your form, and myProperty will be True.

--------

If you are creating a custom AutoScaleMode property for your control (not DataGridView, but your control that derives from it), then when you set the AutoScaleMode value, you have to apply it to an instance of your control, not an instance of DataGridView.

yhee....that what I normally do and it always worked. I don't know why I was having problems but don't bother anymore since I removed the property....thanks for all your help.

but I still have got the problem of AutoScaleMode in the designer.

This is sthe error shown in the designer:

The type 'System.Windows.Forms.DataGridView' has no property named 'AutoScaleMode'. HideEdit

at System.ComponentModel.Design.Serialization.CodeDomSerializerBase.Error(IDesignerSerializationManager manager, String exceptionText, String helpLink) at System.ComponentModel.Design.Serialization.CodeDomSerializerBase.DeserializePropertyAssignStatement(IDesignerSerializationManager manager, CodeAssignStatement statement, CodePropertyReferenceExpression propertyReferenceEx, Boolean reportError) at System.ComponentModel.Design.Serialization.CodeDomSerializerBase.DeserializeAssignStatement(IDesignerSerializationManager manager, CodeAssignStatement statement) at System.ComponentModel.Design.Serialization.CodeDomSerializerBase.DeserializeStatement(IDesignerSerializationManager manager, CodeStatement statement) I don't have any idea why this is happening since I have done the following code: public AutoScaleMode AutoScaleMode { get { return autoScaleMode; } set { autoScaleMode = value; } } Anyone have got a solution please? thanks