Validating TextBox in Form

Question

I am validating textbox1 of below attached project, but i am getting error. Please check it.

Iftikar Hussain · Answer

I have modified your code. Please check Regards, Iftikar

Iftikar Hussain · Answer

in that case you can use MaskedTextBox. Please refer the below link http://www.c-sharpcorner.com/uploadfile/mahesh/maskedtextbox-in-C-Sharp/ Regards, Iftikar

Preeti Agrawalla · Answer

Hey iftikar, thanks ur code is working. If i want that textbox will enter only phone numbers, like it will allow only 10 digit numbers, not less than that and not more than that, then what i have to do???

Preeti Agrawalla · Answer

IT'S Working, but when i press "backspace" key, it also shows error. I want that it will also allow "backspace" key.

Satyapriya Nayak · Answer

private void textBox1_KeyPress(object sender, KeyPressEventArgs e) { if (!System.Text.RegularExpressions.Regex.IsMatch(e.KeyChar.ToString(), "\d+")) { e.Handled = true; MessageBox.Show("error"); } }

Preeti Agrawalla · Answer

Iftikar, Anurag, I m trying to do this, but not getting exact result, plz check my code.

Anurag Sarkar · Answer

private void textBox3_KeyPress( object sender, KeyPressEventArgs e) { if ( char .IsDigit(e.KeyChar) || char .IsControl(e.KeyChar)) { e.Handled = false ; } else { e.Handled = true ; } } You should try to this code.

Iftikar Hussain · Answer

Hi, Try like this this.textBox1.KeyPress += new KeyPressEventHandler(this.textBox1_KeyPress); private void textBox1_KeyPress(object sender, KeyPressEventArgs e) { if (!char.IsControl(e.KeyChar) && !char.IsDigit(e.KeyChar) && e.KeyChar == '.') { e.Handled = true; } } Regards, Iftikar

Preeti Agrawalla · Answer

Anurag, I want that these two textbox will only allow integer numbers not alphabets, for that what i have to do?

Anurag Sarkar · Answer

I am provinding you the sample have a look at it. private void button2_Click(object sender, EventArgs e) { if (textBox3.Text == "") { this.errorProvider1.SetError(textBox3, "This Cannott be Blank"); return; } if (textBox4.Text == "") { this.errorProvider1.SetError(textBox4, "This Cannott be Blank"); return; } int s1, s2, s3; string s; s1 = Convert.ToInt32(textBox3.Text); s2 = Convert.ToInt32(textBox4.Text); s3 = s1 + s2; s = Convert.ToString(s3); frmTest2 myObjViewer = new frmTest2(); // hiding the first form. this.Hide(); myObjViewer.Controls["label2"].Text = s; // displaying the second form myObjViewer.ShowDialog(); } Just run the application you will get the result. While you will be creating new project you need to drag a error provide control from the toolbox. Have a look at the sample.

Preeti Agrawalla · Answer

Yes Anurag

Anurag Sarkar · Answer

Do you want to use Error Provide Validation ?

Anurag Sarkar · Answer

I have just put a simple blank validation you can use what ever you want to.

Preeti Agrawalla · Answer

Anurag, I want to use validation control. so please help me by using Validator. Thanks

Preeti Agrawalla · Answer

I have already attached my project by following this link http://www.codeproject.com/Articles/13922/Validate-user-input-in-Windows-Forms But i m getting error.

Anurag Sarkar · Answer

private void button1_Click(object sender, EventArgs e) { if(textBox1.text=""){MessageBox.Show("Enter Number");return;} if(textBox2.text=""){MessageBox.Show("Enter Second Number");return;} int s1, s2, s3; string s; s1 = Convert.ToInt32(textBox1.Text); s2 = Convert.ToInt32(textBox2.Text); s3 = s1 + s2; s = Convert.ToString(s3); frmTest2 myObjViewer = new frmTest2(); // hiding the first form. this.Hide(); myObjViewer.Controls["label2"].Text = s; // displaying the second form myObjViewer.ShowDialog(); } Just Put this Code in your form 1.

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Answers (16)