I want solution in C# .NET

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C#

ASP.NET

I want solution in c# .net
Problem 1: I want to count the length of a string without using this code: (str.length.tostring();) or without any code. In my concept, first I want to take value from textbox
String str=textbox1.text; then I want to convert it in integer to count the textbox value
Int x=int32.parse(str);
Label1.text=x;
Show code in my way.
Problem 2: I heard that integer returns string, then string returns what? Like when I add two values
Int x=convert.int32(textbox1.text);
Int y=convert.toint32(textbox2.text);
Similarly output should be =convert.int32(textbox3.text);
Output=x+y;
But why I need to convert it in strng=(x+y); though the output will be in integer.
Problem 3: without try catch method I want to show error while adding two numbers that if I put character or string in textbox1 or textbox2 as input, it will show error message that ”put integer”. I want it in if else method.
Every code or solution should be simple as I am beginner. And please give data type conversions when and how I can convert integer to string and vice versa and all conversions short example with explanation.

What I have tried:

i explained above and tried in my own concept.