@Christopher2222 
you are right about pdsolve command.
When i run pdsolve on  2016.2  the answer is correct, But on 2016.1  doesn't work.

On Maple  2016.1 , if i just run  " pdsolve(equa1)"  , it works and Maple give me  the general solution. But with respect to  conditions it doesn't work and output is nothing, not even an error or warning.

About DSOLVE command, i didn't use that because of  my goal was using pdsolve.

@Carl Love 

You are right. 
The main equation that i want to solve is a PDE and i  just wanted to  solve my problem with pdsolve command.

I appreciate your answer.

@Christopher2222
Your answer seem like a general soloution whitout respect to conditions.

 

@Kitonum 

I ran the code on Maple 2016.2  and it works correctly as you say. 

Thanks again for your help. 

@Kitonum 

Thanks for your answer.

When i run your code, "pdsolve give me nothing.

restart; with(PDEtools);
equa1 := diff(u(x, y), x, x)-y*(1+x) = 0;

              / d  / d         \\                
              |--- |--- u(x, y)|| - y (1 + x) = 0
              \ dx \ dx        //                

pdsolve({equa1, u(0, y) = 0, (D[1](u))(0, y) = 0});

What is wrong?

I'm use maple 2016.1  on win-7-64.