Why not use native T-SQL commands?
DECLARE @DataBinary VARBINARY(MAX)
DECLARE @DocumentFullPath VARCHAR(255) = 'd:\image.jpg'
DECLARE @SqlString NVARCHAR(4000) = 'SELECT @DataBinary = DATA FROM OPENROWSET(BULK ''' + @DocumentFullPath + ''', SINGLE_BLOB) AS RESULT(DATA)'
EXECUTE sp_executesql @Sqlstring, N'@DataBinary...