Vista - ParameterBinding

ublic override void SetValue(object component, object value)
{
if (component != null)
{
ISite site = GetSite(component);
IComponentChangeService changeService = null;
if (site != null)
changeService =
(IComponentChangeService)site.GetService(typeof(IComponentChangeService));
// Raise the OnComponentChanging event
changeService.OnComponentChanging(component, this);

// Save the old value
object oldValue = GetValue(component);

try
{
WorkflowParameterBindingCollection parameters =
GetParametersPropertyValue(component);
if (parameters != null)
{
if (value == null)
// Remove the binding from the
ParameterBindings collection
parameters.Remove(this.Name);
else
{
// Add the binding to the ParameterBindings
collection
WorkflowParameterBinding binding = null;
if (parameters.Contains(this.Name))
binding = parameters[this.Name];
else
{
binding = new
WorkflowParameterBinding(this.Name);
parameters.Add(binding);
}

// Set the binding value on the
ParameterBindings collection correspondent binding item
if (value is ActivityBind)

binding.SetBinding(WorkflowParameterBinding.ValueProperty, value as
ActivityBind);
else

binding.SetValue(WorkflowParameterBinding.ValueProperty, value);
}
}
// Raise the OnValueChanged event
OnValueChanged(component, EventArgs.Empty);
}
catch (Exception)
{
value = oldValue;
throw;
}
finally
{
if (changeService != null)
// Raise the OnComponentChanged event
changeService.OnComponentChanged(component,
this, oldValue, value);
}
}
}

/// <summary>
/// Returns a component binding value from the
ParameterBindings collection.
/// </summary>
/// <param name="component"></param>
/// <returns></returns>
public override object GetValue(object component)
{
WorkflowParameterBindingCollection parameters =
GetParametersPropertyValue(component);
if (parameters != null && parameters.Contains(this.Name))
{
if
(parameters[this.Name].IsBindingSet(WorkflowParameterBinding.ValueProperty))
return
parameters[this.Name].GetBinding(WorkflowParameterBinding.ValueProperty);
else
return
parameters[this.Name].GetValue(WorkflowParameterBinding.ValueProperty);
}
return null;
}

/// <summary>
/// Returns the ParameterBindings collection of the
activity component.
/// </summary>
/// <param name="component"></param>
/// <returns></returns>
private static WorkflowParameterBindingCollection
GetParametersPropertyValue(object component)
{
WorkflowParameterBindingCollection
parameterBindingCollection = null;

MemberInfo memberInfo =
component.GetType().GetProperty("ParameterBindings",
BindingFlags.GetProperty | BindingFlags.Public | BindingFlags.Instance
| BindingFlags.FlattenHierarchy | BindingFlags.ExactBinding, null,
typeof(WorkflowParameterBindingCollection), new Type[] { }, new
ParameterModifier[] { });
if (memberInfo != null)
parameterBindingCollection =
component.GetType().InvokeMember("ParameterBindings",
BindingFlags.GetProperty | BindingFlags.Public | BindingFlags.Instance
| BindingFlags.FlattenHierarchy | BindingFlags.ExactBinding, null,
component, new object[] { }, CultureInfo.InvariantCulture) as
WorkflowParameterBindingCollection;
return parameterBindingCollection;
}
}
I have written the above code and still I am not able to bind the
parameters please solve my problem
thanks