How to pass variables in ssis package with source destination mapping configured using C#?

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C#

SSIS

I want to pass variables in SSIS package using c#.I have set a source path(say E:\First) and Destination to Sql db with table configured. I have variables set for both source and destination directory configured.

But the source path(content in file path) is not getting updated .

string strSourceConn = @"c:\Documents and Settings\C\Desktop\File to Place Order\FEB  2011 ORDER 1.txt";
            string strDestConn = System.Configuration.ConfigurationManager.AppSettings["SQLDB"];

       pkg = app.LoadPackage(pkgLocation, null);
         pkg.Variables["strSourceFile"].Value = strSourceConn;  
        pkg.Variables["dConn"].Value = strDestConn; 
                    
            pkgResults = pkg.Execute();

What I have tried:

Code as below:
<pre>string strSourceConn = @"c:\Documents and Settings\C\Desktop\File to Place Order\FEB  2011 ORDER 1.txt";
            string strDestConn = System.Configuration.ConfigurationManager.AppSettings["SQLDB"];

            string pkgLocation = @"C:\Package1.dtsx";
            

            Package pkg;
            Microsoft.SqlServer.Dts.Runtime.Application app;
            DTSExecResult pkgResults;

           app = new Microsoft.SqlServer.Dts.Runtime.Application();
            pkg = app.LoadPackage(pkgLocation, null);
         pkg.Variables["strSourceFile"].Value = strSourceConn;  
        pkg.Variables["dConn"].Value = strDestConn; 
                    
            pkgResults = pkg.Execute();
            Response.Write(pkg.ExecutionResult);