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c# - How to convert a string to int


Convert.ToInt32() Method - Convert string to numeric value



The .NET Convert class allows us to convert a base data type to another base data type. Convert class ToInt32(String) method converts the specified string representation of a number to an equivalent 32-bit signed integer.




Convert class’s ToInt32(String) overloaded method requires passing a parameter. This parameter name is 'value' which data type is String. This parameter passes the String that contains the number to convert. This method returns a 32-bit signed integer that is equivalent to the number in value. If the parameter value is null then the method returns zero (0).




We also can convert a string object to a numeric value (int 32-bit integer) by using Int32 Parse(String) method or Int32 TryParse() method. Int32 TryParse() method returns an additional value that indicates whether the conversion succeeded.




The following ASP.NET C# example code demonstrates to us how can we convert a string to an int32 numeric value in the .NET framework.





ToInt32.aspx



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


<!DOCTYPE html>

<script runat="server">
    protected void Button1_Click(object sender, System.EventArgs e) {
        string testString = "55";
        int testNumber = Convert.ToInt32(testString);
        int sum = testNumber + 5;
        Label1.Text = "Test String: " + testString;
        Label1.Text += "<br />Test String now converted to number[Int32]: " + testNumber;
        Label1.Text += "<br />Test Number+5[after convert]: " + sum;
    }
</script>

<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
    <title>How to convert string to numeric value (number ToInt32) in asp.net</title>
</head> 
<body>
    <form id="form1" runat="server">
    <div>
        <h2 style="color:Red">asp.net example: ToInt32()</h2>
        <asp:Label 
             ID="Label1" 
             runat="server" 
             Font-Size="Large"
             ForeColor="DodgerBlue"
             Font-Bold="true"
             Font-Italic="true"
             >
        </asp:Label>
        <br /><br />
        <asp:Button 
             ID="Button1" 
             runat="server" 
             OnClick="Button1_Click"
             Font-Bold="true"
             Text="Convert String To Number"
             ForeColor="DarkBlue"
             />   
    </div>
    </form>
</body>
</html>




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