CODEWITHSUNDEEP
c#
user2326333
user2326333

Reputation: 83

Validating the textbox in c#.net

hi i want to set my text box only with the alphabets i have tried the following code, it's working fine for the keyboard keys.but if i press the numpad key numbers it is accepting numbers can anyone please help me, much appreciated thanks.

bool isvalid = true;

    private void textBox1_KeyDown(object sender, KeyEventArgs e)
    {
        if ((e.KeyValue <65 || e.KeyValue > 90) && (e.KeyValue<97||e.KeyValue>122) e.KeyValue != 8))
        {
            isvalid = false;
            MessageBox.Show("only alphabets");

        }
        else
        {
            isvalid = true;

        }
    }

    private void textBox1_KeyPress(object sender, KeyPressEventArgs e)
    {
        if (isvalid == false)
        {
            e.Handled = true;
        }
        else
        {
            e.Handled = false;
        }

    }

Upvotes: 2

Views: 164

Answers (2)

Kambiz Shahim
Kambiz Shahim

Reputation: 2590

In the KeyDown event what you will get on e.KeyValue is code of key on keyboard not characters, See Keys Enumeration. This condition is true for A-Z and a-z. 

 (e.KeyValue >= Keys.A && e.KeyValue <= Keys.Z)

Upvotes: 1

Freelancer
Freelancer

Reputation: 9064

Use Regex.IsMatch property.

Can Use Following Code:

private void txtAlphaOnly_TextChanged(object sender, EventArgs e)
{
    if (System.Text.RegularExpressions.Regex.IsMatch("^[a-zA-Z]", txtAlphaOnly.Text))
    {
        MessageBox.Show("Alphabets Only Allowed");            
    }
}

MSDN:

http://msdn.microsoft.com/en-IN/library/system.text.regularexpressions.regex.ismatch.aspx

Hope Its helpful.

Upvotes: 3

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