Generating connection string in web.config while loading dll in application

using System.Reflection;
using System.IO; // For FileNotFoundException definition.

public void myDllStuff(string myDll) // Put your dll/assembly here
{
string dllName = myDll; 
Assemly asm = null;

// Try to load assembly
 try{
     asm = Assembly.Load(asmName); //you can use Assembly.LoadFrom for more flexibility 
    Type[] types = asm.GetTypes(); // To get types from your dll
    noArgumentMethod(asm, "myDll.myMethod");// put your method and dll
    withArgumentMethod(asm, "myDll.myArgumentMethod", true, 1);
    }
 catch
    {
     // Can't find assembly. 
     // Put your exception code.
    }
}
public void noArgumentMethod(string asm, string methodName)
{
// below is the code to run a method from your dll which have no arguments.
    Type myMethod = asm.GetType(methodName); 
    object obj = Activator.CreateInstance(myMethod);
    MethodInfo mi = myMethod.GetMethod(methodName); //"myMethod"
    mi.Invoke(obj, null);
// the above line will run the method and perform whatsoever is within the method of dll. 
}

public void withArgumentMetho(string asm, string methodName, bool argument1, int argument2)
{
  // assumning two arguments
 Type myArgumentMethod = asm.GetType(methodName);//"myDll.myArgumentMethod"
 object obj = Activator.CreateInstance(myArgumentMethod);
// Invoke myArgumentMethod() with two arguments
 MethodInfo mi = myArgumentMethod("myArgumentMethod");
 mi.Invoke(obj, new object[]{argument1, argument2});
}