[Mono-list] ExecuteNonQuery always return the value -1

[j cy]

As u know, the SqlCommand's function ExecuteNonQuery returns the affected 
lines
But when I used in mono, no matter what happened,it always return the value 
-1
This problem exists in Mono 1.1.7 and 1.1.8
And how can I solve this problem?
Is this also exists in OracleCommand's function ExecuteNonQuery?

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