My Calculator code is not working. Please assist

Question

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace SoloLearn
{
class Program
{
static void Main(string[] args)
{
int operation = 0;
int results = 0;

Console.WriteLine("Type ypur first number:");
String strFirstNo=Console.ReadLine();
double FirstNo=convert.toDouble("strFirstNo");

Console.WriteLine("Type the second Number");
String strSecondNo = Console.ReadLine();
double SecondNo =Convert.ToDouble("strSecondNo");

Console.WriteLine("Please enter the operator + (Addition), - (Subtraction), / (Divition), *(Multiplication), ^ (Root), % (Remainder):");
String strOperator= Console.ReadLine();

If (strOperator == "Addition" || StrOperator == "+")
{
Operation=1;
}
Else If(strOperator== "Subtraction" || strOperator == "-")
{
Operation= 2;
}
Else If(strOperator =="Division")|| strOperator == "/")
{
Operation= 3;
}
Else If(strOperator == "Multiplication" || strOperator == "*")
{
Operation = 4;
}
Else If(strOperator== "^" || strOperator == "Root")
{
Operation = 5;
}
Else If(strOperation== "%" || strOperation == "Remainder")
}
Operation = 6;
}

Switch (Operation)
{
Case 1:
Result = firstNo + SecondNo;
Break;

Case 2:
Result = FirstNo - SecondNo;
Break;

Case 3:
Result = FirstNo / SecondNo;
Break;

Case 4:
Result = FirstNo * SecondNo;
Break

Case 5:
result = FirstNo ^ SecondNo;
Break;

Case 6:
result = FirstNo % SecondNo;
Break;

}
Concole.WriteLine("\nResult of:" + FirstNo + "" + strOperator + "" + SecondNo + "" + "=" + Result + ".");
Console.ReadKey();

}
}

Answer 1

I have fixed it as far as I could, most of it is working now:
https://code.sololearn.com/ckHIQp04EdFl/?ref=app

Answer 2

Could you link the code?