C#在调用Oracle存储过程进行保存数据，出现乱码，请问如何解决？(100分)

C#代码如下：
[WebMethod(Description="修改操作员信息")]
public string Update_Operator(string User_ID, string User_Name, int Home, int Depart, int User_Type, int Auth, string ID_Card, string Exprie_Date, string Creator, string MSISDN, int Status)
{
OleDbCommand cmd = new OleDbCommand("sp_update_operator", conn);
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.Add(new OleDbParameter("i_UserID", OleDbType.VarChar, 11, ParameterDirection.Input, false, 0, 0, "RegionID", DataRowVersion.Current, User_ID));
cmd.Parameters.Add(new OleDbParameter("i_Name", OleDbType.VarWChar, 20, ParameterDirection.Input, false, 0, 0, "RegionID", DataRowVersion.Current, User_Name));
cmd.Parameters.Add(new OleDbParameter("i_Home", OleDbType.Integer, 4, ParameterDirection.Input, false, 0, 0, "RegionID", DataRowVersion.Current, Home));
cmd.Parameters.Add(new OleDbParameter("i_Depart", OleDbType.Integer, 4, ParameterDirection.Input, false, 0, 0, "RegionID", DataRowVersion.Current, Depart));
cmd.Parameters.Add(new OleDbParameter("i_UserType", OleDbType.Integer, 4, ParameterDirection.Input, false, 0, 0, "RegionID", DataRowVersion.Current, User_Type));
cmd.Parameters.Add(new OleDbParameter("i_Auth", OleDbType.Integer, 4, ParameterDirection.Input, false, 0, 0, "RegionID", DataRowVersion.Current, Auth));
cmd.Parameters.Add(new OleDbParameter("i_Card", OleDbType.VarChar, 32, ParameterDirection.Input, true, 0, 0, "RegionID", DataRowVersion.Current, ID_Card));
cmd.Parameters.Add(new OleDbParameter("i_Exprie", OleDbType.VarChar, 8, ParameterDirection.Input, false, 0, 0, "RegionID", DataRowVersion.Current, Exprie_Date));
cmd.Parameters.Add(new OleDbParameter("i_MSISDN", OleDbType.VarChar, 11, ParameterDirection.Input, false, 0, 0, "RegionID", DataRowVersion.Current, MSISDN));
cmd.Parameters.Add(new OleDbParameter("i_Creator", OleDbType.VarChar, 11, ParameterDirection.Input, false, 0, 0, "RegionID", DataRowVersion.Current, Creator));
cmd.Parameters.Add(new OleDbParameter("i_Stat", OleDbType.Integer, 4, ParameterDirection.Input, false, 0, 0, "RegionID", DataRowVersion.Current, Status));
cmd.Parameters.Add(new OleDbParameter("o_Result", OleDbType.VarChar, 64, ParameterDirection.Output, true, 0, 0, "RegionID", DataRowVersion.Current, ""));
try
{
conn.Open();
cmd.ExecuteNonQuery();
return cmd.Parameters["o_Result"].Value.ToString();
}
catch (Exception ex)
{
return ex.Message.ToString();
}
finally
{
conn.Close();
}
}
Oracle存储过程参数如下：
create or replace procedure sp_update_operator(i_User_ID in number,
i_Name in varchar2,
i_Home in number,
i_Depart in number,
i_UserType in number,
i_Auth in number,
i_Card in varchar2,
i_Exprie in varchar2,
i_MSISDN in varchar2,
i_Creator in number,
i_Stat in number,
o_Result out varchar2)
在C#中执行SQL语句可以正常插入或修改数据，可用如上方法进行修改数据若提交中文的操作员姓名，查询表中的数据变成了乱码，请问该如何解决？
在线等待

经过调试发现，在浏览器中调用不会出现乱码，但通过Delphi调用时就会出现上述现象，请问如何解决

OleDbCommand.Parameters.Add 方法有一个设置编码类型的参数．
可以试一下

我将接收到的中文字符保存到文本文件里,发现内容是????

接受答案了.