c# - Radio Button Validation in WinForms -

so have multiple different radio buttons, in different group boxes. before user able "save" form, fields need filled in. trying make sure radio buttons filled in. @ moment trying use following code:

 if (!(this.roundtrip.checked || this.oneway.checked))             {                 messagebox.show("select option trip type");                   if (!(this.northrad.checked || this.expressrad.checked || this.expressrad.checked))                 {                     messagebox.show("select option route type");                  }                 if (!(this.yesneeded.checked || this.notneeded.checked))                 {                     messagebox.show("select option accessibility");                  }                 if (this.adultnum.value == 0 && this.seniornum.value == 0 && this.childnum.value == 0)                 {                     messagebox.show("select @ least 1 ticket");                  }                 return;             } 

with code not allowing me click on save button, no message boxes come up. , after fill in radio boxes cannot click save button. appreciated.

your logic seems correct but, return @ last line. maybe need this;

private void btnsave_clicked()     {         if (!isvaliddataentered()) return;          save();     }      private bool isvaliddataentered()     {         if (!(this.roundtrip.checked || this.oneway.checked))             messagebox.show("select option trip type");          else if (!(this.northrad.checked || this.expressrad.checked || this.expressrad.checked))             messagebox.show("select option route type");          else if (!(this.yesneeded.checked || this.notneeded.checked))             messagebox.show("select option accessibility");          else if (this.adultnum.value == 0 && this.seniornum.value == 0 &&                  this.childnum.value == 0)             messagebox.show("select @ least 1 ticket");          else             return true;          return false;     }