sharepoint webpart property disappear after a day (C#)

Question

I developed a custom webpart with a webpart property with some textboxes and it works partially.

If I deploy the project, the written text in the property is away. This is ok.

But my MAIN Problem is, that about after one day the text in the property disappear is away. I use SharePoint 2010.

Here is my code:

[WebBrowsable(true), Category("category"), Personalizable(PersonalizationScope.Shared), WebDisplayName("Hello"), WebDescription("Description1")]
public string hello
{
    get { return _hello; }
    set { _hello = value; }
}
public static string _hello;

Answer 1

Your code should look like below, its a base class that the webpart calls.... in the base class im setting the webpart settings, Iv made a custom one for you where you will see it in the properties of the webpart when you edit the webpart.

    private const string c_YourCustomVairable = "";

    public BaseWebPart()
    {
        _YourCustomVairable= c_YourCustomVairable;
    }

    internal string _YourCustomVairable;

    [SPWebCategoryName("This will be shown in webpart settings")]
    [DefaultValue(c_YourCustomVairable)]
    [Personalizable(PersonalizationScope.Shared)]
    [WebDisplayName("name to display")]
    [WebDescription("this is the description")]
    [WebBrowsable(true)]

    public string YourCustomVairable
    {
        get { return _YourCustomVairable; }
        set { _YourCustomVairable = value; }
    }

Base class explained:

http://msdn.microsoft.com/en-us/library/microsoft.sharepoint.webpartpages.webpart.aspx

how to make webparts:

http://msdn.microsoft.com/en-us/library/ee231579.aspx

Hope this helps :)

Answer 2

I am not sure a day but your code doesn't look right too me, perhaps there is an update process running that causes the webpart to reinit itself.

Try changing:

[WebBrowsable(true), Category("category"), Personalizable(PersonalizationScope.Shared),     WebDisplayName("Hello"), WebDescription("Description1")]
public string hello
{
    get { return _hello; }
    set { _hello = value; }
}
public static string _hello;

too:

public static string _hello;
[WebBrowsable(true), Category("category"), Personalizable(PersonalizationScope.Shared), WebDisplayName("Hello"), WebDescription("Description1")]
public string hello
{
    get { return _hello; }
    set { _hello = value; }
}

See James solution below for a spot which I missed, cheers James!