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我在访问SQL Server中的存储过程时遇到错误

Server Error in '/' Application.
Procedure or function 'ColumnSeek' expects parameter '@template', which was not supplied. 

当我通过.net的数据连接调用带有参数的存储过程时(System.data.SqlClient),即使我提供了参数,也会发生这种情况.这是我的代码.

SqlConnection sqlConn = new SqlConnection(connPath);
sqlConn.Open();

//METADATA RETRIEVAL
string sqlCommString = "QCApp.dbo.ColumnSeek";
SqlCommand metaDataComm = new SqlCommand(sqlCommString, sqlConn);
metaDataComm.CommandType = CommandType.StoredProcedure;
SqlParameter sp = metaDataComm.Parameters.Add("@template",SqlDbType.VarChar,50);
sp.Value = Template;

SqlDataReader metadr = metaDataComm.ExecuteReader();

我的存储过程是:

   USE [QCApp]
   GO
   SET ANSI_NULLS ON
   GO
   SET QUOTED_IDENTIFIER ON
   GO

   ALTER PROCEDURE [dbo].[ColumnSeek] 
       @template varchar(50)
   AS
   EXEC('SELECT Column_Name, Data_Type 
   FROM [QCApp].[INFORMATION_SCHEMA].[COLUMNS] 
   WHERE TABLE_NAME = ' …