acceptin only letters in text box in asp.net using c sharp

Question

1.00/5 (2 votes)

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C#

ASP.NET

how to give only letters in textbox in asp.net with c sharp without using javascript

Posted 9-Feb-12 22:55pm

saranyaraju

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Comments

Sergey Alexandrovich Kryukov 10-Feb-12 5:18am

The question is a pure abuse. I can explain why. This is asking "do this, but without that". Why, may I ask you? At least explain your motivation. If you need help, explain your goal, your requirements, expected behavior and your rationale, always explain why.
--SA

3 solutions

Solution 3

Hi,
Try this-

We can use Regular expression validator for this:
In the validation expression property keep- "^\d+$."

XML

<asp:TextBox ID="TextBox1" runat="server" Style="z-index: 100; left: 259px; position: absolute;
top: 283px" ValidationGroup="check"></asp:TextBox>

<asp:RegularExpressionValidator ID="RegularExpressionValidator1" runat="server" ControlToValidate="TextBox1"
ErrorMessage="Please Enter Only Numbers" Style="z-index: 101; left: 424px; position: absolute;
top: 285px" ValidationExpression="^\d+$" ValidationGroup="check"></asp:RegularExpressionValidator>

Javed

Posted 9-Feb-12 23:25pm

Jαved

Updated 9-Feb-12 23:29pm

v2

Comments

Rajeev Jayaram 10-Feb-12 5:53am

Isn't your solution validating numbers and not letters? OP asked for letters. Never mind, atleast she can do that stuff herself.

Solution 1

if regular expressions can be used by you then use them else you can use this piece of code:

C#

string oldText = string.Empty;
    private void textBox2_TextChanged(object sender, EventArgs e)
    {
        if (textBox2.Text.All(chr => char.IsLetter(chr)))
        {
            oldText = textBox2.Text;
            textBox2.Text = oldText;

            textBox2.BackColor = System.Drawing.Color.White;
            textBox2.ForeColor = System.Drawing.Color.Black;
        }
        else
        {
            textBox2.Text = oldText;
            textBox2.BackColor = System.Drawing.Color.Red;
            textBox2.ForeColor = System.Drawing.Color.White;
        }
        textBox2.SelectionStart = textBox2.Text.Length;
    }

It will make the text box blink on bad input. Please note that it also seems to support paste operations as well.

Posted 9-Feb-12 23:08pm

AtreyaRC

Updated 9-Feb-12 23:11pm

v3

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Aniket Yadav · Accepted Answer · 2012-02-09T23:17:00

Solution 2

This Tutorial From Code Project Will Help U Solve ur problem

The 30 Minute Regex Tutorial[^]

Posted 9-Feb-12 23:17pm

Aniket Yadav

Comments

Aniket Yadav 10-Feb-12 5:39am

Accept The Answer If It Has Helped You. Doing So Will Boost The Confidence Of The Members Who Is Helping Others.