Getting Error Message Box When Textbox1.Text Is Empty

Getting error message box when textbox1.text is empty

One solution would be to use TryParse() instead of Parse():

double.TryParse(textBox1.Text, out aantalgroep);

This will set aantalgroep to the value you're expecting on a successful parse, and set aantalgroep to 0 (really default(double) which is 0) for an invalid string.

Show Message Box if TextBox is Blank or Empty using C#

In your code in btnSubmit_Click method, when you call RegisterClientScriptBlock you missed '); symbols at then end of your alert. So, your javascript is incorrect, and browser displays an error in developers tools. It should be like this:

protected void btnSubmit_Click(object sender, EventArgs e)
{

    if (txtUID.Text.Length == 0 || txtPass.Text.Length == 0)
    {

        ScriptManager.RegisterClientScriptBlock(this, this.GetType(),
            "alertMessage", 
            "alert('Please type your User ID and Password correctly and click Submit button again.  Thanks');", true);
    }
    else
    {
          //execute some code here
    }
 }

How do i display a message box if the textbox is empty after a search

Looks like you are missing a parameter on the first MessageBox.Show call:

If Competitor.Text="" Then
    MessageBox.Show("This student wasn't a ranking placeholder!",
                    MessageBoxButtons.OK,
                    MessageBoxIcon.Error) 
End If

It should be like the second call:

If Competitor.Text="" Then
    MessageBox.Show("This student wasn't a ranking placeholder!",
                    "** a caption here **",
                    MessageBoxButtons.OK,
                    MessageBoxIcon.Error) 
End If

How to generate an error when important input text boxes are empty

Maybe you can try this

Private Sub Continue_click()

Dim c as Control

    For Each c In Me.Controls
        If TypeName(c) = "TextBox" Then

            If Trim(c.Value) = "" Then
              MsgBox "Please fill out all required information", vbInformation
            Exit Sub
            End If

        End If
    Next c
End Sub

How to check for empty textbox

If you want to check empty for all text box control in your page .Try IsNullOrWhiteSpace

 foreach (Control child in this.Controls)
    {
        TextBox textBox = child as TextBox;
        if (textBox != null)
        {
            if (!string.IsNullOrWhiteSpace(textBox.Text))
            {
                MessageBox.Show("Text box can't be empty");
            }
        }
    }

Error message to show which text boxes are blank C#

Splitting up your code would be a start:

if  ((FirstnameText.Text.Trim().Length == 0){
   errorMessage("firstname is empty");
}

if (SurnameText.Text.Trim().Length == 0){
   errorMessage("surname is empty");
}

Get the idea?

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