Object reference not set to an instance of an object.

Question

Hi i am trying to check whether my RadioButton is checked or not in a method.If checked execute some code else execute another code.

But when i debug it I am getting this error

Object reference not set to an instance of an object

 

I have gone through many links but not able to correct it.

Below is my .aspx.cs code

 

public static string[] GetArea(string prefixText, int count)

{

     RadioButton rb1 = RadioButton2;

         if (rb1.Checked == true)

         {

                 //execute some code

               //return some value;

         }

        else

        {

              //execute some other code

             //return some value;

         }

}

 

RadioButton2 is defined in my .aspx page

<asp:RadioButton ID="RadioButton2" CssClass="radio-button-style" runat="server" GroupName="list" Text="Chemist" ToolTip="SEARCH" />

 

I am getting error at this line

if (rb1.Checked == true)

Please help.Thankyou