Need A Help For Executing Script File Having Creation Of Stored Procedure From C#

 Hi,
While executing script file from c# i have faced a problems like
1)Error at Go statement
2) Must declare a scalar variable "@prmEvent"
 The following approach i have followed to executing script file.
 
SqlConnection conn = new SqlConnection();
conn.ConnectionString = "server=localhost;initial catalog=Parish;Integrated Security=SSPI;";
conn.Open();
 string commandText = GetCommandText("Script file name");

 SqlCommand databaseCmd = new SqlCommand(commandText, conn);

 databaseCmd.ExecuteNonQuery();


 GetCommandTex()  method reads the script file from starting to end and returns script text.
 
 My script file having following script.
set ANSI_NULLS ON
set QUOTED_IDENTIFIER ON
Go
if exists (select 1 from dbo.sysobjects where id = Object_id('dbo.[prcSearchEvents]')
and (type = 'P' or type = 'RF'))
begin
 drop proc dbo.[prcSearchEvents]
end
Go

CREATE PROCEDURE [dbo].[prcSearchEvents]
@prmStartDate datetime, 
@prmEndDate datetime,
@prmEvent char(1)

AS

BEGIN
    SELECT Title,FirstName,MiddleName,LastName,S.SexName as Sex, (CASE @prmEvent WHEN 'B' THEN DateOfBirth
            WHEN 'D' THEN DateOfDeath
            WHEN 'M' THEN DateOfMarriage
        END ) as EventDate
    from dbo.Parishioner P
    left outer join dbo.Sex S on P.SexId = S.SexId
    where (CASE @prmEvent WHEN 'B' THEN DateOfBirth
            WHEN 'D' THEN DateOfDeath
            WHEN 'M' THEN DateOfMarriage
        END )
    between @prmStartDate and @prmEndDate
  
END
 
 
But when i executing script file  having creation of stored procedure , i got such problem but other cases ( having normal sql commands) did not get any problm