A QRCode must be big enough to be scanned easily and small enough to fit into a page without occupying much space. You can resize the control, as well as the symbols within the control to improve the resolution of the control. Complete the following steps to change the size of the control, as well as the symbols.

In the Designer

1. Resize the QRCode by clicking the edges of the QRCode and drag it till it reaches the desired height or width.
2. Resize the symbols by clicking the Smart Tag. In the C1QRCode Tasks Menu, set the SymbolSize property as per your requirement.
3. Alternatively, right click the QRCode and select Properties to open the Properties window. Set the Height, Width and SymbolSize properties in the Properties window.

In Source View

Set the Height, Width and SymbolSize properties within the <cc1:C1QRCode> tag to resize the QRCode.

<cc1:C1QRCode ID="C1QRCode1" runat="server" Height="150px" Text="QRCode Sample Text" Width="150px" SymbolSize="5" />

In Code

Add the following code to the Page_Load event to set the Height, Width and SymbolSize properties in code view.

C1QRCode1.Height = 150;
C1QRCode1.Width = 150;
C1QRCode1.SymbolSize = 5;

C1QRCode1.Height = 150
C1QRCode1.Width = 150
C1QRCode1.SymbolSize = 5

What You've Accomplished

When you run your application, notice that the size of the QRCode as well as its symbols is now bigger.