MVC - Display Nullable checkbox

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Replace

    @Html.CheckBoxFor(x => x.MyQuestions)

with

    @Html.CheckBox("MyQuestions", Model.MyQuestions ?? false)

MVC - Custom Validate Checkbox - Get checkbox value in JavaScript (client)

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1. Validation 

        public IEnumerable<ModelClientValidationRule> GetClientValidationRules(ModelMetadata metadata, ControllerContext context)

        {

            var rule = new ModelClientValidationRule

            {

                ValidationType = "validatecheckbox",

                ErrorMessage = "Fix it!"

            };

            rule.ValidationParameters.Add("fields", string.Join(",", _fields));

            yield return rule;

        }

2. JS

$.validator.addMethod('validatecheckbox', function (value, element, params) {

    debugger

    var isValid = true;

    if ($(params)[0].fields[1].val() == "True"){

        if ($(params)[0].fields[0][0].checked == false) {

            isValid = false;

        }

    }

});

MVC - How to make a read only checkbox

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Replace 

@model WebApplication3.Models.EmployeeList

@using (Html.BeginForm(null, null, FormMethod.Post))

{

    if (Model.myEmployees != null)

    {

        foreach (var item in Model.myEmployees)

        {

            @Html.CheckBoxFor(modelItem => item.IsValid.Value, new { id = item.EmployeeID})

            @Html.DisplayFor(modelItem => item.FirstName)

            <br />

        }

    }

}

with

@model WebApplication3.Models.EmployeeList

@using (Html.BeginForm(null, null, FormMethod.Post))

{

    if (Model.myEmployees != null)

    {

        foreach (var item in Model.myEmployees)

        {

            @Html.CheckBoxFor(modelItem => item.IsValid.Value, new { id = item.EmployeeID, @disabled = "true"})

            @Html.DisplayFor(modelItem => item.FirstName)

            <br />

        }

    }

}

MVC - Fix Error - CS0428: Cannot convert method group 'GetValueOrDefault' to non-delegate type 'bool'. Did you intend to invoke the method?

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To fix it replace

@model WebApplication3.Models.EmployeeList

@using (Html.BeginForm(null, null, FormMethod.Post))

{

    if (Model.myEmployees != null)

    {

        foreach (var item in Model.myEmployees)

        {

                        @Html.CheckBoxFor(modelItem => item.IsValid.GetValueOrDefault, new { id = item.EmployeeID })

                        @Html.DisplayFor(modelItem => item.FirstName)

        }

    }

}

with

@model WebApplication3.Models.EmployeeList

@using (Html.BeginForm(null, null, FormMethod.Post))

{

    if (Model.myEmployees != null)

    {

        foreach (var item in Model.myEmployees)

        {

                        @Html.CheckBoxFor(modelItem => item.IsValid.Value, new { id = item.EmployeeID })

                        @Html.DisplayFor(modelItem => item.FirstName)

        }

    }

}

Fix Error CS0266 Cannot implicitly convert type 'bool?' to 'bool'. An explicit conversion exists (are you missing a cast?)

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to fix it replace

@model WebApplication3.Models.EmployeeList

@using (Html.BeginForm(null, null, FormMethod.Post))

{

    if (Model.myEmployees != null)

    {

        foreach (var item in Model.myEmployees)

        {

                        @Html.CheckBoxFor(modelItem => item.IsValid, new { id = item.EmployeeID })

                        @Html.DisplayFor(modelItem => item.FirstName)

        }

    }

}

with

@model WebApplication3.Models.EmployeeList

@using (Html.BeginForm(null, null, FormMethod.Post))

{

    if (Model.myEmployees != null)

    {

        foreach (var item in Model.myEmployees)

        {

                        @Html.CheckBoxFor(modelItem => item.IsValid.Value, new { id = item.EmployeeID })

                        @Html.DisplayFor(modelItem => item.FirstName)

        }

    }

}

CS0119 'Employee List' is a type, which is not valid in the given context

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 To fix this error replace (semicolon) in view

@model WebApplication3.Models.EmployeeList;

with

@model WebApplication3.Models.EmployeeList

MSSQL - Check if varchar contains specified characteer

 

Declare @Test varchar(100) = 'aaa@aaa';

IF @Test Like '%@%'

BEGIN

  print ' contains @'

END

ELSE

BEGIN

print ' doesn''t contain @'

END

MSSQL - How to increase length of existing varchar

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ALter Table Test01
Alter Column RealName Varchar(100) 

MSSQL - Rename column in table

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exec sp_rename 'TableName.CurrentColumnName', 'NewColumnName', 'COLUMN' 

MSSQL - Rename table

 

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 exec sp_rename 'CurrentTableName' , 'NewTableName'

MSSQL - Fix Error - Column names in each table must be unique. Column name 'IsValid' in table 'Test1' is specified more than once.

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To fix it replace

 Alter Table Test1
Add IsValid bit not null Default 0

with  

IF COL_LENGTH('dbo.Test1', 'IsValid') Is Null
Begin
Alter Table Test1
Add IsValid bit not null Default 0
End

MSSQL - Add column only if it doesn't exist

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IF COL_LENGTH('dbo.Test3', 'IsValid') is null
Begin
    Alter Table Test3 Add IsValid bit not null default 0
End

Select * from Test3

MSSQL - Fix Error - ALTER TABLE only allows columns to be added that can contain nulls, or have a DEFAULT definition specified, or the column being added is an identity or timestamp column, or alternatively if none of the previous conditions are satisfied the table must be empty to allow addition of this column. Column 'IsValid' cannot be added to non-empty table 'Test1' because it does not satisfy these conditions.

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To fix it replace

 Alter Table Test1
Add IsValid bit not null

 with  

Alter Table Test1
Add IsValid bit not null Default 0

MVC5 - Add modal (popup dialog)

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 1. View

@{
    ViewBag.Title = "Home Page";
}
<div class="AddPopUp">
    @Html.Label("Add pop up")
</div>
<div class="modal fade" id="MyPopUp" role="dialog">
    <div class="modal-dialog">
        <div class="modal-content">
            <div class="modal-body">
                here are going your controls etc
            </div>
        </div>
    </div>
</div>

@section Scripts{
    <script type="text/javascript">
        $(document).ready(function () {
            $(".AddPopUp").click(function (e) {
                $('#MyPopUp').modal('show');
            });
        });
    </script>
    }

2. CSS

.modal-content{
    height: 500px;
    width: 700px;
}

MVC - Simplest Extension Method example

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 1. Model

   public interface IExtensionTest
    {
         void DoSomething();
    }
    public class ExtensionTest: IExtensionTest
    {
        public void DoSomething() { }
    }
    public static class SomethingElse {
        public static string ReturnSomething(this IExtensionTest t, string s)
        {
            return "returning: " + s;
        }
    }

2. Controller

        public ActionResult Index()
        {
            IExtensionTest e = new ExtensionTest();
            var res = e.ReturnSomething("bbbbb");
            return View();
        }

MVC - C# - Check if DateTime is today

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            DateTime d = Convert.ToDateTime("1/1/2000");
            if (d != DateTime.Today)
            {
                // do something here.
            }

MVC - C# - Check if time is greater than something

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            TimeSpan startSomething = new TimeSpan(8, 0, 0);
            TimeSpan endSomething = new TimeSpan(16, 0, 0);
            TimeSpan now = DateTime.Now.TimeOfDay;
            if ((now > startSomething) && (now < endSomething))
            {
                //do something here
            } 

MVC - C# - Check if today is Friday (check todays day name)

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         if (System.DateTime.Now.DayOfWeek == DayOfWeek.Friday)
            {
                // do somehting here
            }

MVC - C# - Convert Now to Universal Time UTC

 

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           String t = Convert.ToDateTime(DateTime.Now).ToUniversalTime().ToString("yyyy/MM/dd HH:mm UTC");
 

 

MVC - C# - Format Date

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MVC - C# - Format Date