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SqlConnection conn = new SqlConnection();
conn.ConnectionString = "...........";
SqlCommand cmd = new SqlCommand();
conn.Open();
cmd.Connection = conn;
cmd.CommandText = "aa";
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.Add("@a", SqlDbType.VarChar, "");
cmd.Parameters["@a"].Direction = ParameterDirection.Output;
cmd.Parameters.Add("@b", SqlDbType.VarChar, "");
cmd.Parameters["@b"].Direction = ParameterDirection.Output;
cmd.Parameters.Add("@c", SqlDbType.VarChar, "");
cmd.Parameters["@c"].Direction = ParameterDirection.Output;
cmd.EndExecuteNonQuery();
Response.Write(cmd.Parameters["@a"].Value.ToString());