c# - If Statement for Floats? -

how make if statements using floats? code have follows:

{float p1 = float.parse(textbox1.text); if (p1 == ""){messagebox.show("home");}} 

the p1 if statement on second line not work. how make proper if statement this?

edit: should explain. goal check empty box. can't use string command since want interpret numbers.

thanks in advance help.

float values cannot "empty". if try parsing empty string float, runtime error.

you need check string being empty before parsing, , parse more "conservative" tryparse method not throw exception.

if (string.isnullorwhitespace(textbox1.text)) {     messagebox.show("home"); } float p1; if (!float.tryparse(textbox1.text, out p1)) {     messagebox.show("textbox1 not float"); } 

note: in general, comparing floats equality == operator not idea, because float not exact representation. this q&a discusses problem in java, issue relevant in languages use floating point representation.