ConvertToDouble Example Syntax C-Sharp ASP.NET | C# ConvertToDouble | Source Code
ConvertToDouble Example Syntax C-Sharp ASP.NET | C# ConvertToDouble | Source Code
Summary: – Illustrates using ConvertToDouble with Source Code Syntax Example in C-Sharp ASP.NET.
Purpose:
Converts positive and negative numbers into double data type
Syntax:
Convert.ToDouble(expression)
Convert.ToDouble(expression)
Parameters | Description | expression | -1.79769313486231570E+308 through -4.94065645841246544E-324 for negative values; 4.94065645841246544E-324 through 1.79769313486231570E+308 for positive values. |
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Result Data Type | Description | double | double precision floating point number |
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Quick Example | Dim double1 As Double = Convert.ToDouble(1.33) TextBox1.Text = double1 Returns 1.33 |
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Step 1: Click on cs to Cut-n-paste code into ConvertToDouble.aspx.cs
using System; using System.IO; using System.Data; //**************************************************************************************** // Purpose: Converts positive and negative numbers into double data type // // Syntax: Convert.ToDouble(expression) // // Parameter1: expression - -1.79769313486231570E+308 through // -4.94065645841246544E-324 for negative values; // 4.94065645841246544E-324 through // 1.79769313486231570E+308 for positive values. // // Result: double - double precision floating point number // // Quick Example: Dim double1 As Double = Convert.ToDouble(1.33) // TextBox1.Text = double1 // Returns 1.33 // // //**************************************************************************************** // This example is from http://idealprogrammer.com // It shows how you can use CDbl syntax in C-Sharp ASP.NET partial class _ConvertToDouble : System.Web.UI.Page { protected void Page_Load(object sender, System.EventArgs e) { Label1.Text = "Example #1: Convert.ToDouble(1.33) "; double double1 = Convert.ToDouble(1.33); TextBox1.Text = double1.ToString(); // Returns 1.33 Label2.Text = "Example #2: Convert.ToDouble(-3.4) "; double Double2 = Convert.ToDouble(-3.4); TextBox2.Text = Double2.ToString(); // Returns -3.4 Label3.Text = "Example #3: Convert.ToDouble(5)"; double Double3 = Convert.ToDouble(5); TextBox3.Text = Double3.ToString(); // Returns 5 } } |
Step 2: Click on XML to Cut-n-paste code into ConvertToDouble.aspx
< %@ Page Language="VB" AutoEventWireup="false" CodeFile="ConvertToDouble.aspx.cs" Inherits="_ConvertToDouble" %> < !DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head runat="server"> <title></title> </head> <body> <form id="form1" runat="server"> <div> <h1><asp:label ID="Label1" runat="server" Text="Label"></asp:label> </h1> <asp:textbox ID="TextBox1" runat="server"></asp:textbox><br /> <h1><asp:label ID="Label2" runat="server" Text="Label"></asp:label> </h1> <asp:textbox ID="TextBox2" runat="server"></asp:textbox><br /> <h1><asp:label ID="Label3" runat="server" Text="Label"></asp:label> </h1> <asp:textbox ID="TextBox3" runat="server"></asp:textbox><br /> </div> </form> </body> </html> |
Prerequistes:
- Install Visual Web Developer 2010
- Install SQL Server Express
- Download Northwind and Pubs Databases
- Attach Northwind Database to Databases in Sql Express
- Attach pubs Database to Databases in Sql Express
Notes:
- You can build your own library of syntax examples by using same web site over and over and just add new web forms to it.
Instructions:
- Use Visual Web Developer 2010
- Create new web site;
- Click File/New Web Site
- Select ASP.NET Website Template
- Select C-Sharp for Language
- name of Web Site could be CSharp_ASPNET_Syntax.
- Add New folder named “Functions”
- Right-click project name in solution explorer;
- add new folder;
- name of folder could be: Functions
- Add New subfolder named “ConversionFunctions”
- Right-click Functions folder in solution explorer;
- add new folder;
- name of folder could be: ConversionFunctions
- Add New subfolder named “TypeConversionFunctions”
- Right-click Functions folder in solution explorer;
- add new folder;
- name of folder could be: TypeConversionFunctions
- Add Web Form Named ConvertToDouble to TypeConversionFunctions folder
- Right-click TypeConversionFunctions folder;
- add new item;
- Select Web Form
- Check place code behind in separate file
- Web Form name could be ConvertToDouble
- Click on cs in step 1 at the top of this page to copy code into code-behind ConvertToDouble.aspx.cs
- Click on XML in step 2 above to copy code into web form ConvertToDouble.aspx
- Right-click on ConvertToDouble.aspx in solution explorer and select view in browser