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How can I check validation in winfrom text Box in c#?
Posted 23-Nov-12 21:52pm
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Solution 3

if (textBox1.Text.Trim() == "")
            {
                MessageBox.Show("Insert Your Message");
            }
            else if (textBox2.Text.Trim() == "")
            {
                MessageBox.Show("Insert Your Message");
            }
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Solution 2

There are a couple of ways, but the basic methods are to handle either the TextChanged event (if you want to prevent any invalid entry) or the Validating event (if you want to check it when the user is finished)
 
In either case, you can then check the Text property against your criteria.
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