Enter the text box value before?

Question

I want to user to enter textbox value before continue the run next method. After message box shows and click ok. application goes to MyNextMethod. Therefore I cannot enter my valid value to text box.

    If (textbox1 =="")
    {
    MessageBox.Show("Please enter valid entery.")
    }
    MyNextMethod();

Answer 1

  If (textbox1.Text == string.empty)
  {
      MessageBox.Show("Please enter valid entery.")
  }
  else
  {
      MyNextMethod();
  }

Answer 2

Use

return;

after

MessageBox.Show();

function

Answer 3

This is your requirement or goal: You want user to enter textbox value before continue the run next method. It is OK with your old code.

If (textbox1 =="")
{
MessageBox.Show("Please enter valid entery.")
}

But you call MyNextMethod() method, it means whether user enter the value or not you allow to go MyNextMethod().

Conclusion, you can do as you like:
1. you can append return; after MessageBox.Show(); as first Answer
2. you can also call MyNextMethod() with else. as 2nd Answer

Answer 4

You can use textbox onChange() event. If text is changed in textbox , check if entered value is a number and calculate total value according to the other value. try this code

If (textbox1.Text =="" || textbox1.Text.Length==0)
{
    MessageBox.Show("Please enter valid entery.");
    Console.ReadLine();
}
else
{
     MyNextMethod();
}

You can also use textbox1_LostFocus() so when Focus lost you can call your NextMethod

private void textBox1_LostFocus(object sender, System.EventArgs e)
{
   MyNextMethod();
}

Answer 5

You can also do this if textbox is empty

if(textbox1.text=="")
{
    ClientScript.RegisterStartupScript(Page.GetType(), "validation", "<script language='javascript'>alert('Please enter text')</script>");
}
else
{
     // your next method
}