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POHow to check if a "." has been input into a TextBox?
 

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  1. POHow to check if a "." has been input into a TextBox?
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    <p>How to check if a "." has been input into a TextBox?</p> <p>is it something like:</p> <pre><code>if (TextBox1.Text == ".") { //Do something... } </code></pre> <p>because when I do this, it seems to not check what is in the TextBox1 and just continue with the next line of code</p> <p>Here is my code:</p> <pre><code>private void btnContinue1_Click(object sender, RoutedEventArgs e) { if (string.IsNullOrEmpty(HouseholdNoTextBox.Text)) { textBlockError2.Visibility = Visibility.Collapsed; textBlockError1.Visibility = Visibility.Visible; } if (HouseholdNoTextBox.Text.Length &gt;= 3) {//checking to see if it has a length greater than 2 textBlockError1.Visibility = Visibility.Collapsed; // collapse the first error box if it is visible textBlockError2.Visibility = Visibility.Visible; // and make visible the second } if (HouseholdNoTextBox.Text == ".") { textBlockError1.Visibility = Visibility.Visible; } if (HouseholdNoTextBox.Text.Length &lt;= 2 &amp;&amp; HouseholdNoTextBox.Text.Length &gt; 0) { textBlockError1.Visibility = Visibility.Collapsed; textBlockError2.Visibility = Visibility.Collapsed; NavigationService.Navigate(new Uri("/MainPage.xaml", UriKind.Relative)); } </code></pre> <p>I have also tried:</p> <pre><code>if (HouseholdNoTextBox.Text.Contains(".")) { textBlockError1.Visibility = Visibility.Visible; } </code></pre> <p>I have also tried:</p> <pre><code>private void btnContinue1_Click(object sender, RoutedEventArgs e) { string houseHoldNo = HouseholdNoTextBox.Text.ToString(); if (string.IsNullOrEmpty(HouseholdNoTextBox.Text) || houseHoldNo.Contains(".")) // adding it here along with the first if statement { textBlockError2.Visibility = Visibility.Collapsed; textBlockError1.Visibility = Visibility.Visible; } } </code></pre> <p>I have also tried:</p> <p>private void btnContinue1_Click(object sender, RoutedEventArgs e) { string houseHoldNo = HouseholdNoTextBox.Text.ToString();</p> <pre><code> if (string.IsNullOrEmpty(HouseholdNoTextBox.Text)) { textBlockError2.Visibility = Visibility.Collapsed; textBlockError1.Visibility = Visibility.Visible; } if (houseHoldNo.Contains(".")) { textBlockError1.Visibility = Visibility.Visible; } } </code></pre> <p>and this above code does the same as the other.. it skips to the last if statement.</p>
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    1. COWell where are you putting that code? It has to be in some event which is fired when the textbox text changes...
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      1. USJon Skeet
    2. CORather then having a button always enabled, handle TextChanged or KeyUp events on the TextBox and enable the button only when your conditions are satisfied.
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      1. USWilliam Melani
    3. COHave you put a breakpoint on the line where you're evaluating `houseHoldNo.Text` to see what its value is?
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      1. POHow to check if a "." has been input into a TextBox?
      1. USMichael Itzoe
 

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