Round(Decimal)
Rounds a decimal value to the nearest integral value.

Round(Double)
Rounds a double-precision floating-point value to the nearest integral value.

Round(Decimal, Int32)
Rounds a decimal value to a specified number of fractional digits.

Math.Round(3.44, 1); //Returns 3.4.
Math.Round(3.45, 1); //Returns 3.4.
Math.Round(3.46, 1); //Returns 3.5.
Math.Round(4.34, 1); // Returns 4.3
Math.Round(4.35, 1); // Returns 4.4
Math.Round(4.36, 1); // Returns 4.4

Round(Decimal, MidpointRounding)
Rounds a decimal value to the nearest integer. 
A parameter specifies how to round the value if it is midway between two other numbers.

Round(Double, Int32)
Rounds a double-precision floating-point value to a specified number of fractional digits.

Round(Double, MidpointRounding)
Rounds a double-precision floating-point value to the nearest integer.
A parameter specifies how to round the value if it is midway between two other numbers.

Round(Decimal, Int32, MidpointRounding)
Rounds a decimal value to a specified number of fractional digits. 
A parameter specifies how to round the value if it is midway between two other numbers.

3.4 = Math.Round( 3.45, 1, MidpointRounding.ToEven)
3.5 = Math.Round( 3.45, 1, MidpointRounding.AwayFromZero)

-3.4 = Math.Round(-3.45, 1, MidpointRounding.ToEven)
-3.5 = Math.Round(-3.45, 1, MidpointRounding.AwayFromZero)

Round(Double, Int32, MidpointRounding)
Rounds a double-precision floating-point value to the specified number of fractional digits. 
A parameter specifies how to round the value if it is midway between two other numbers.

 // The example displays the following output:
// 2.125 --> 2.13
// 2.135 --> 2.13
// 2.145 --> 2.15
// 3.125 --> 3.13
// 3.135 --> 3.14
// 3.145 --> 3.15
This code example produces the following results:

 3.4 = Math.Round( 3.45, 1)
-3.4 = Math.Round(-3.45, 1)

 3.4 = Math.Round( 3.45, 1, MidpointRounding.ToEven)
 3.5 = Math.Round( 3.45, 1, MidpointRounding.AwayFromZero)

-3.4 = Math.Round(-3.45, 1, MidpointRounding.ToEven)
-3.5 = Math.Round(-3.45, 1, MidpointRounding.AwayFromZero)

Console.WriteLine(sizeof(int));
Console.WriteLine(sizeof(char));
Console.WriteLine(sizeof(bool));
Console.WriteLine(sizeof(decimal));
Console.WriteLine(sizeof(float));

 4
2
1
16
4

 int a = 23;
float b = 3.14f;
Console.WriteLine(a.GetType());
Console.WriteLine(b.GetType());

System.Int32
System.Single

long obj1 = 356;
long obj2 = 54;
float obj3 = 234;
Console.WriteLine(object.ReferenceEquals(obj1.GetType(), obj2.GetType()));
Console.WriteLine(object.ReferenceEquals(obj1.GetType(), obj3.GetType()));

True
False

//<data type> <variable name>;
Int a;

//<data type> <variable name>=value;
Int a=23;
Int a;//declare تعریف
a=23;//مقدار دهی اولیه initializing
Int a=23;//تعریف و مقدار دهی در یک خط
Int a,b,c=23;//تعریف چند متغیر و مقدار دهی در یک خط

 int abc;
long _abcd;
float @abcd;
bool main_button;
decimal piValue;
string firstName;
string first_name;
bool button55_on;

long _a.5bc5d;
float @ab cd;
decimal pi@Value;
//استفاده از کلمات کلیدی سی شارپ که کامپایلر آنها را مجاز نمی‌داند
bool class;
string namespace;
string string;
int static;

 < data type >? < variable name >= null; //syntax

int? a = null; //assigning null
int? b = 55; //assigning null and a value
var? c = 55 //it will give error

 int? a = null;
int? b = 22;
Console.WriteLine(a.HasValue);
//------------
Console.WriteLine(b.HasValue);
Console.WriteLine(b.Value);

 False
True
22

 test obj; //allocating reference on stack
obj= new test(55);//allocating object on heap

 int a = 55;//declare a and initialize
int copya = a;//copya contains the copy of value a

test obj;
obj=new test(23);
test objCopy;
objCopy = obj;

public class CustomProfile
    {
        [Required(ErrorMessage="*")]
        [StringLength(50)]
        [System.Web.Mvc.Remote(action: "CheckUserName",
                                       controller: "User",
                                       HttpMethod = "POST",
                                       ErrorMessage = "این نام کاربری وجود دارد")]
        public string Username{ get; set; }
        [Required(ErrorMessage = "*")]
        public string Password{ get; set; }
        [Required(ErrorMessage = "*")]
        public string FirstName{ get; set; }
        [Required(ErrorMessage = "*")]
        public string LastName{ get; set; }
        
        [Required(ErrorMessage = "*")]
        [StringLength(10, ErrorMessage = "کدملی باید 10 رقم باشد")]
        public string NationalCode { get; set; }
        [Required(ErrorMessage = "*")]
        public string Address { get; set; }

        [RegularExpression(@"\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*",
                           ErrorMessage = "آدرس ایمیل معتبر نیست")]
        [System.Web.Mvc.Remote(action: "CheckEmail",
                                       controller: "User",
                                       AdditionalFields = "Username",
                                       HttpMethod = "POST",
                                       ErrorMessage = "این ایمیل وجود دارد")]
        public string Email{ get; set; }

        [StringLength(11, ErrorMessage = "تلفن باید 11 رقم باشد")]
        public string PhoneNo{ get; set; }

        [StringLength(11, ErrorMessage = "موبایل باید 11 رقم باشد")]
        public string MobileNo{ get; set; }
        
        
        public string[] Roles{ get; set; }
        
        public string LastActivityDate{ get; set; }
        public string LastLoginDate { get; set; }
        public string CreationDate { get; set; }
        public bool IsLockedOut{ get; set; }
    }

@model Sama.Models.CustomProfile
@{
    ViewBag.Title = "Create";
    Layout = "~/Views/Shared/_Layout.cshtml";
    
}
<script src="@Url.Content("~/Scripts/jquery.validate.min.js")" type="text/javascript"></script>
<script src="@Url.Content("~/Scripts/jquery.validate.unobtrusive.min.js")" type="text/javascript"></script>
@using (Html.BeginForm(actionName: "Create", controllerName: "User"))
    {
        @Html.ValidationSummary(true)
     
        <fieldset>
            <legend>کاربر جدید</legend>
            <div>
                <table>
                    <tr>
                        <td>
                            <div>
                                @Html.LabelFor(model => model.Username, "نام کاربری")
                            </div>
                        </td>
                        <td>
                            <div>
                                @Html.EditorFor(model => model.Username)
                                @Html.ValidationMessageFor(model => model.Username)
                            </div>
                        </td>
                    </tr>
                    <tr>
                        <td>
                            <div>
                                @Html.LabelFor(model => model.Password, "کلمه عبور")
                            </div>
                        </td>
                        <td>
                            <div>
                                @Html.PasswordFor(model => model.Password)
                                @Html.ValidationMessageFor(model => model.Password)
                            </div>
                        </td>
                    </tr>
                    <tr>
                        <td>
                            <div>
                                @Html.LabelFor(model => model.FirstName, "نام")
                            </div>
                        </td>
                        <td>
                            <div>
                                @Html.EditorFor(model => model.FirstName)
                                @Html.ValidationMessageFor(model => model.FirstName)
                            </div>
                        </td>
                    </tr>
                    <tr>
                        <td>
                            <div>
                                @Html.LabelFor(model => model.LastName, "نام خانوادگی")
                            </div>
                        </td>
                        <td>
                            <div>
                                @Html.EditorFor(model => model.LastName)
                                @Html.ValidationMessageFor(model => model.LastName)
                            </div>
                        </td>
                    </tr>
                    <tr>
                        <td>
                            <div>
                                @Html.LabelFor(model => model.NationalCode, "کد ملی")
                            </div>
                        </td>
                        <td>
                            <div>
                                @Html.EditorFor(model => model.NationalCode)
                                @Html.ValidationMessageFor(model => model.NationalCode)
                            </div>
                        </td>
                    </tr>
                    <tr>
                        <td>
                            <div>
                                @Html.LabelFor(model => model.Email, "ایمیل")
                            </div>
                        </td>
                        <td>
                            <div>
                                @Html.EditorFor(model => model.Email)
                                @Html.ValidationMessageFor(model => model.Email)
                            </div>
                        </td>
                    </tr>
                    <tr>
                        <td>
                            <div>
                                @Html.LabelFor(model => model.PhoneNo, "تلفن")
                            </div>
                        </td>
                        <td>
                            <div>
                                @Html.EditorFor(model => model.PhoneNo)
                                @Html.ValidationMessageFor(model => model.PhoneNo)
                            </div>
                        </td>
                    </tr>
                    <tr>
                        <td>
                            <div>
                                @Html.LabelFor(model => model.MobileNo, "موبایل")
                            </div>
                        </td>
                        <td>
                            <div>
                                @Html.EditorFor(model => model.MobileNo)
                                @Html.ValidationMessageFor(model => model.MobileNo)
                            </div>
                        </td>
                    </tr>
                    <tr>
                        <td>
                            <div>
                                @Html.LabelFor(model => model.Address, "آدرس")
                            </div>
                        </td>
                        <td>
                            <div>
                                @Html.TextAreaFor(model => model.Address, 5, 30, null)
                                @Html.ValidationMessageFor(model => model.Address)
                            </div>
                        </td>
                    </tr>
                    <tr>
                        <td>
                            نقش‌ها </td>
                        <td>
                            @Helper.CheckBoxList("Roles", (List<SelectListItem>)ViewBag.Roles)
                        </td>
                    </tr>
                    <tr>
                        <td>
                        </td>
                        <td>
                            <input type="submit" value="ذخیره" class="btn btn-primary" />
                        </td>
                    </tr>
                </table>
            </div>
        </fieldset>
    
    }

The data goes up to 2018-06-03 and includes:

• Badges – 27M rows, 1GB data.
• Comments – 66M rows, 22GB
• PostHistory -106M rows, 174GB (new)
• Posts – 41M rows, 106GB
• Users – 9M rows, 1GB.
• Votes – 151M rows, 5GB.
• And a few smaller supporting tables: PostHistoryTypes, PostLinks, PostTypes, and Tags.