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;
}