.net调用sql存储过程

/// 执行一段SQL语句通过output参数返回结果
/// </summary>
/// <param name="sConnStr"/>连结字符串</param>
/// <param name="sSql" />需执行的Sql语句</param>
/// <returns>返回结果</returns>
public static string ExecuteQueryOutput(string sConnStr,string sSql)
{
SqlCommand cmd = null;
try
{
cmd = new SqlCommand(sSql);
cmd.Connection = new SqlConnection(sConnStr);
cmd.CommandType=CommandType.StoredProcedure;
cmd.Connection.Open();
SqlParameter mypara=cmd.Parameters.Add("@reValue",SqlDbType.VarChar,200);
mypara.Direction=ParameterDirection.Output;
cmd.ExecuteNonQuery();
string reValue=(string)cmd.Parameters["@reValue"].Value.ToString();
return reValue;
}
finally
{
cmd.Connection.Close();
if(cmd != null) cmd.Dispose();
}
}