A field initializer cannot reference the nonstatic field, method, or property..

[Neelam Chamoli]

Hi,

I Working on Asp.net 2.0. I am declaring and initializing variables globally like this:-

        double a1=0.0081;       
        double B3=12.61/100;
        double B4=B3-a1;
        double B5=B4-a1;
        double B6=B5-a1;

double F8=Convert.ToDouble(TxtSqFeet.Text.ToString());
		double F9=Convert.ToDouble(TxtLinealFeet.Text.ToString());			
		double G6=Convert.ToDouble(TxtTravelTime.Text.ToString());
		double G11=Convert.ToDouble(TxtLiners.Text.ToString());

And find the following error:- A field initializer cannot reference the nonstatic field, method, or property..

Second Error is TxtSqFeet expect a class.

Please help me to resolve this error.