Specifies a default value for the parameter, should the value that the parameter is bound to be uninitialized when the Parameter.Evaluate(System.Web.HttpContext, System.Web.UI.Control) method is called.
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The Parameter.DefaultValue property is used in scenarios where the parameter is bound to a value, but the value is null or cannot be resolved when the System.Web.UI.WebControls.Parameter object is evaluated.
If the Parameter.DefaultValue property of the parameter is changed, the Parameter.OnParameterChanged method is called.