How to write values to service reference variable

Question

I added wsdl reference in my project. The following code is there in Refrence.cs file:

public partial class MainRequest : object, System.ComponentModel.INotifyPropertyChanged
{
private test[] metadata;
private string name;
}

public partial class test : object, System.ComponentModel.INotifyPropertyChanged
{
private string key1;
private string value1;
[System.Xml.Serialization.XmlAttributeAttribute()]
public string Key {
   get {
      return this.key1;
      }
      set {
         this.key1 = value1;
         this.RaisePropertyChanged("Key");
      }
 }

I have written code in my project like this:

myReference.MainRequest objMyReq = new myReference.MainRequest();
objMyReq.name = "CompanyName";
objMyReq.metadata = //  How can I give key and values in this?