Skip to main content

c# - How to compare two strings by ignoring case


String Compare() Method - case insensitive/ ignore case



The .NET C# developers can compare two specified String objects using the String class’s Compare() method. The String Compare() method returns an integer that indicates their relative position in the sort order. This method is overloaded.




String Compare(String, String, Boolean) method overload compares two specified String objects by ignoring or honoring their case. So we can use this overloaded method to compare two string objects by ignoring case (case insensitive String comparison).




This overloaded method requires three parameters. First, two parameters are two String objects those we need to compare. And third parameter is a Boolean value. We must set the Boolean parameter value to True when we need to ignore the case during comparison. Or we must set the Boolean parameter value to False to respect the case during String comparison.




If the method returned integer is less than zero, then the first String (strA) is less than the second String (strB). If it returns zero, then two specified Strings are equal. And if the return value is greater than zero, then the first String is greater than the second string.




The following ASP.NET C# example code demonstrates to us how can we compare two Strings by ignoring their case.




CompareIgnoreCase.aspx



<%@ Page Language="C#" %>


<!DOCTYPE html>

<script runat="server">
    protected void page_Load(object sender, System.EventArgs e) {
        if(!this.IsPostBack)
        {
            TextBox1.Text = "Jones";
            TextBox2.Text = "jones";
        }
    }
    protected void Button1_Click(object sender, System.EventArgs e) {
        string testString1 = TextBox1.Text.ToString();
        string testString2 = TextBox2.Text.ToString();
        int result = string.Compare(testString1, testString2,true);
        Label1.Text = "";

        if(result == 0)
        {
            Label1.Text += "Two strings are equal";
        }
        else if(result == 1)
        {
            Label1.Text += "Test String1 is greater than Test String2";
        }
        else if (result == -1)
        {
            Label1.Text += "Test String1 is less than Test String2";
        }
        
    }
</script>

<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
    <title>How to compare two string in asp.net (case insensitive/ ignore case)</title>
</head> 
<body>
    <form id="form1" runat="server">
    <div>
        <h2 style="color:Navy">asp.net string example: Compare() [Ignore case]</h2>
        <asp:Label 
             ID="Label1" 
             runat="server" 
             Font-Size="Large"
             ForeColor="HotPink"
             Font-Bold="true"
             Font-Italic="true"
             >
        </asp:Label>
        <br /><br />
        <asp:Label 
             ID="Label2" 
             runat="server" 
             Text="Test String1"
             ForeColor="DodgerBlue"
             >
        </asp:Label>
        <asp:TextBox 
             ID="TextBox1" 
             runat="server" 
             BackColor="DodgerBlue" 
             ForeColor="Snow"
             >
        </asp:TextBox>
        <br />
        <asp:Label 
             ID="Label3" 
             runat="server" 
             Text="Test String2"
             ForeColor="DodgerBlue"
             >
        </asp:Label>
        <asp:TextBox 
             ID="TextBox2" 
             runat="server" 
             BackColor="DodgerBlue" 
             ForeColor="Snow"
             >
        </asp:TextBox>
        <br /><br />
        <asp:Button 

             ID="Button1" 
             runat="server" 
             OnClick="Button1_Click"
             Font-Bold="true"
             Text="Compare"
             ForeColor="DodgerBlue"
             />   
    </div>
    </form>
</body>
</html>








Labels:

Popular posts from this blog

Restricting Jetpack Compose TextField to Numeric Input Only

Jetpack Compose has revolutionized Android development with its declarative approach, enabling developers to build modern, responsive UIs more efficiently. Among the many components provided by Compose, TextField is a critical building block for user input. However, ensuring that a TextField accepts only numeric input can pose challenges, especially when considering edge cases like empty fields, invalid characters, or localization nuances. In this blog post, we'll explore how to restrict a Jetpack Compose TextField to numeric input only, discussing both basic and advanced implementations. Why Restricting Input Matters Restricting user input to numeric values is a common requirement in apps dealing with forms, payment entries, age verifications, or any data where only numbers are valid. Properly validating input at the UI level enhances user experience, reduces backend validation overhead, and minimizes errors during data processing. Compose provides the flexibility to implement ...
Read more

jetpack compose - TextField remove underline

Compose TextField Remove Underline The TextField is the text input widget of android jetpack compose library. TextField is an equivalent widget of the android view system’s EditText widget. TextField is used to enter and modify text. The following jetpack compose tutorial will demonstrate to us how we can remove (actually hide) the underline from a TextField widget in an android application. We have to apply a simple trick to remove (hide) the underline from the TextField. The TextField constructor’s ‘colors’ argument allows us to set or change colors for TextField’s various components such as text color, cursor color, label color, error color, background color, focused and unfocused indicator color, etc. Jetpack developers can pass a TextFieldDefaults.textFieldColors() function with arguments value for the TextField ‘colors’ argument. There are many arguments for this ‘TextFieldDefaults.textFieldColors()’function such as textColor, disabledTextColor, backgroundColor, cursorC...
Read more

jetpack compose - Image clickable

Compose Image Clickable The Image widget allows android developers to display an image object to the app user interface using the jetpack compose library. Android app developers can show image objects to the Image widget from various sources such as painter resources, vector resources, bitmap, etc. Image is a very essential component of the jetpack compose library. Android app developers can change many properties of an Image widget by its modifiers such as size, shape, etc. We also can specify the Image object scaling algorithm, content description, etc. But how can we set a click event to an Image widget in a jetpack compose application? There is no built-in property/parameter/argument to set up an onClick event directly to the Image widget. This android application development tutorial will demonstrate to us how we can add a click event to the Image widget and make it clickable. Click event of a widget allow app users to execute a task such as showing a toast message by cli...
Read more