c# - login error "cannot convert implicitly void to string" -

i have login page following code:

procedure:

alter procedure [dbo].[login_validation]  @email varchar(100), @password varchar(50)  begin  declare @cnt integer set @cnt = (select count(*) subscriber_master emailid=@email , [password]=@password , [status]='y')  end 

class file:

public void login_validation(string email, string password) {  sqlconnection con = new sqlconnection(configurationmanager.connectionstrings["connstring"].connectionstring); try {     localconnection_class(con);     sqlcommand cmd = new sqlcommand("login_validation", con);     cmd.commandtype = commandtype.storedprocedure;     cmd.parameters.add(new sqlparameter("@email", sqldbtype.varchar, 100)).value = email;     cmd.parameters.add(new sqlparameter("@password", sqldbtype.varchar, 50)).value = password;     sqldatareader dr = cmd.executereader();     if (dr.hasrows)     {         dr.read();     }      cmd.dispose();     con.close(); } catch (exception) { } } 

cs file:

protected void btnsubmit_click(object sender, eventargs e) { string login = obj.login_validation(txtemail.text, txtpassword.text); } 

i not able understand how solve error. can me out? it's giving me error: "cannot convert implicitly void string @ obj.login_validation".

like dj kraze told

your string login = obj.login_validation(txtemail.text, txtpassword.text); suggested method login_validation return string need 2 things

first
change method header
public void login_validation(string email, string password)
public string login_validation(string email, string password)

secound need add return in method

for example

public string login_validation(string email, string password)     {         //...          try         {             //...              return //<- string if succeed         }         catch (exception)         {              return //<- string if error occurs         }          // or place 1 return here     }