What is the easy way to set all empty string textbox ("") to null value in Csharp winform?

Question

Suppose I don't want to use

if (string.IsNullOrEmpty(textbox1.Text))
{
     textbox1.Text = null;
}

for every textbox controls in form, is there a easier way to do it ?

Solution 1

You can iterate through the ControlCollection of the given form, e.g. frmMain.Controls
Now this will be the basic Control object, so you would need a test to see if it is of type TextBox.

.NET 2.0 - you'll have to check this manually
.NET 3.0+ - use the .OfType<TextBox> extension method to give you only a list of IEnumerable<TextBox>

Note that iterating through this from the form will only give you text boxes on that form. If you bind text boxes to a container it won't show up there.

Safest bet would be to write a recursive function that walks through all the control collections and passes the reference to your test function to perform your test and update.

Solution 2

Simple way is Loop through every control, see the below code

 foreach (Control C in this.Controls)
 {
       if (C is TextBox)
       {
            if (C.Text == "")
            {
                 C.Text = null;
             }
       }
 }

Solution 3

It is one more way

foreach(Control txt in this.Controls)
{
   if(txt.GetType() == typeof(TextBox))
         if(string.IsNullOrEmpty(txt.Text))
            txt.Text = null;
}

Hope it helps

Solution 4

Try this:

foreach(Control c in this.Controls)
{
      if (c.GetType().FullName == "System.Windows.Forms.TextBox")
      {
          TextBox t = (TextBox)c;
          t.Clear();
      }
}

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