Getting the value of string variable

How can the string literal - "ErrorLabel" be replaced with string variable style in the second 开发者_JAVA技巧line ? FYI ..The style names will be stored in a xml file.

 string style = "ErrorLabel";
 Style styItem = LayoutRoot.Resources["ErrorLabel"] as Style;
 fld.Settings.CellValuePresenterStyle = styItem;

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This should do it:

string style = "ErrorLabel";
Style styItem = LayoutRoot.Resources[style] as Style;
fld.Settings.CellValuePresenterStyle = styItem;