Column, Parameter, Or Variable #1: Cannot Find Data Type SqlDatareader

Hello Everyone,
A have a Managed Stored Procedure ([Microsoft.SqlServer.SqlProcedure]). In it I would like to call a UserDefinedFunction:
public static SqlInt32 IsGetSqlInt32Null(SqlDataReader dr, Int32 index)
   {
    if(dr.GetSqlValue(index) == null)
      return SqlInt32.Null;
    else
      return dr.GetSqlInt32(index)
   }
I than allways get the following ErrorMessage:
Column, parameter, or variable #1: Cannot find data type SqlDatareader.

Is it not possibel to pass the SqlDatareader to a SqlFunction, do the reading there and return the result.
My original Problem is, that datareader.GetSqlInt32(3) throws an error in case there is Null in the DB. I thought SqlInt32 would allow Null.
Would appreciate any kind of help! Thanks

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Sub Page_Init(sender As Object, e As EventArgs)
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Dim txtPart As New TextBox()
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SSIS package "Package3.dtsx" starting.

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Task failed: Bulk Insert Task 1

Task failed: Bulk Insert Task

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