Prevent users from resizing the window/form size

Question

User can change form size. I do not find a property of form that do not allow user to change form size.

Answer 1

Just add this 2 lines of C# code for your form (inside InitializeComponent() function):

this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedSingle;
this.ImeMode = System.Windows.Forms.ImeMode.NoControl;

Tested with Visual Studio 2017 with .NET 4.6.1