'X' no es un valor de IterationCount válido para una estructura RepeatBehavior. Un valor de IterationCount debe representar un número mayor que o igual a cero, pero no infinito.
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English version
'X' is not a valid IterationCount value for a RepeatBehavior structure. An IterationCount value must represent a number that is greater than or equal to zero but not infinite.
.Net Framework