Set diffrent value for Sharepoint custom property of same web part in multiple diffrent pages

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WebParts

SharePoint2010

I have visual web part and i am attempting to set custom property unique value on each pages. For example i have two aspx pages. Deal.aspx and Fund.aspx. Both page is having same web part used. When i set the value custom property in web part of Deal.aspx the same value gets reflect in Fund.aspx page web part as well. I read about PersonalizationScope but it did not help for my scenario. Below is the custom property i have created.

public static string ListName;
[Category("Extended Settings"),
Personalizable(PersonalizationScope.User),
WebBrowsable(true),
WebDisplayName("Enter List Name"),
WebDescription("Please Enter a List Name")]

public string _ListName
{
get { return ListName; }
set
{
// Sample Validation
Regex oRegEx = new Regex("[a-zA-Z]+");
if (!oRegEx.IsMatch(value))
throw new Microsoft.SharePoint.WebPartPages.
WebPartPageUserException(
"Please enter alphabeth characters only");
ListName = value;
}
}

I will highly appreciate the help. Any thoughts ?