.net - c# stored procedure launch: Procedure or function expects parameter, which was not supplied -

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i've got stored procedure:

alter procedure [dbo].[sp_xnet_backup]     @backuppath nvarchar(4000) = null,     @rc int out begin      set @rc = 0     ...     ...

launched c# project in way:

sqlparameter[] paramters = new sqlparameter[2]; byte = 0;  string sp = "dbo.sp_xnet_backup";  using (sqlconnection conn = dbmanager.createadoconnmaster()) {     conn.open();      sqlcommand cmd = new sqlcommand(sp, conn);     cmd.commandtype = commandtype.storedprocedure;     paramters[i++] = new sqlparameter("@backuppath", completepath);     paramters[i] = new sqlparameter("@rc", sqldbtype.int);     paramters[i].direction = parameterdirection.inputoutput;      foreach (sqlparameter param in paramters)         cmd.parameters.add(param);      cmd.executenonquery();     ...     ...

but gives me error:

procedure or function 'sp_xnet_backup' expects parameter '@rc', not supplied.

rather using parameterdirection.inputoutput, use parameterdirection.output

cmd.parameters.add("@rc", sqldbtype.int).direction = parameterdirection.output; try {     if (cmd.connection.state == connectionstate.closed)     {         cmd.connection.open();     }     cmd.executenonquery();     result = convert.toint32(cmd.parameters["@rc"].value);     } catch (exception) {  } {                     cmd.connection.close();     response.write(result);  }

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