asp.net调用存储过程

存储过程如下
CREATE procedure  Pr_AddFile
      @FileName varchar(100),
      @FileUrl varchar(200),
      @FileKind varchar(100)
AS
Declare @RecordCount as int
SET @RecordCount=(select count(*) FROM File1 WHERE FileName=@FileName)
IF @RecordCount<1
      BEGIN
          INSERT INTO File1([FileName],FileUrl,FileKind) VALUES (@FileName,@FileUrl,@FileKind)
          Return @@Identity
      END
GO

配置文件
<appSettings>
    <add key="ConnectionString" value="server=wcj;database=files;uid=sa;pwd="/>
</appSettings>

具体实现过程
     string strconn = System.Configuration.ConfigurationManager.AppSettings["ConnectionString"].ToString();
      try
        {
            SqlConnection conn = new SqlConnection(strconn);
            conn.Open();
            SqlCommand cmmd = new SqlCommand();
            cmmd.CommandType = CommandType.StoredProcedure; //数据库执行存储过程
            cmmd.CommandText = "Pr_AddFile";//存储过程名
            cmmd.Connection = conn;

            //参数的集合
            SqlParameter[] parameters ={
                new SqlParameter("@FileName", SqlDbType.VarChar, 100),
                new SqlParameter("@FileUrl", SqlDbType.VarChar, 200),
                new SqlParameter("@FileKind", SqlDbType.VarChar, 200),
                new SqlParameter("@ReturnValue",SqlDbType.Int,4)
            };

            //为每个参数赋值
            parameters[0].Value = sFileName.ToString();
            parameters[1].Value = sFileUrl.ToString();
            parameters[2].Value = sFileKind.ToString();
            parameters[3].Direction = ParameterDirection.ReturnValue;
            foreach (SqlParameter parameter in parameters)
            {
                cmmd.Parameters.Add(parameter);
            }

            //执行存储过程
            cmmd.ExecuteNonQuery();
            int parameterFileID = int.Parse(cmmd.Parameters["@ReturnValue"].Value.ToString());//返回参数
            return parameterFileID;
        }
        catch (Exception ex)
        {
            throw new Exception("数据库连接失败！", ex);
        }
        finally
        {
        }