.NET GENES

Hi, A common issue when deserializing a JSON object in C# is to pass the filepath of the JSON file to the Deserialize() method instead of the string content of that file such as the code below. var obj = JsonConvert.DeserializeObject<Employee>( @"D:\Data\Employee.json" ) When calling the Deserialize() method, you need to make sure that the parameter passed is a JSON string value instead of the file path. Use StreamReader class or File.ReadAllText() to get the content of the JSON file. using (StreamReader reader = new StreamReader( @"D:\Data\Employee.json" )) { string json = reader.ReadToEnd(); var obj = JsonConvert.DeserializeObject<Employee>(json); }

Hi all, Given a database table such as User with fields Id, UserName and Password that will be mapped to a class using Entity Framework called User with an additional field of ConfirmPassword. public class User { public int Id { get ; set ; } public string UserName { get ; set ; } public string Password { get ; set ; } public string ConfirmPassword { get ; set ; } } I would like to exclude the ConfirmPassword field from being mapped to the User table. So, after doing some searching, the solution is to decorate the property with [NotMapped] attribute and make sure to reference the DataAnnotations namespace ( System.ComponentModel.DataAnnotations.Schema ). using System.ComponentModel.DataAnnotations.Schema; public class User : IEntity { public int Id { get ; set ; } public string UserName { get ; set ; } public string Password { get ; set ; } [NotMapped] public string ConfirmPassword { get ; set ; } }

Hello, Here's how to update DataTable value(s) using Method or Query syntax in LINQ. C# Code private void Form1_Load( object sender, EventArgs e) { DataTable dt = new DataTable( "tblEntTable" ); dt.Columns.Add( "ID" , typeof ( string )); dt.Columns.Add( "Amount" , typeof ( decimal )); dt.Rows.Add( new object [] { "1" , 100.51}); dt.Rows.Add( new object [] { "2" , 200.52}); dt.Rows.Add( new object [] { "3" , 500.24}); dt.Rows.Add( new object [] { "4" , 400.31}); dt.Rows.Add( new object [] { "5" , 600.88}); dt.Rows.Add( new object [] { "6" , 700.11}); //QuerySyntax(dt); MethodSyntax(dt); } private void QuerySyntax(DataTable dt) { var result = from row in dt.AsEnumerable() select new { ID = row.Field< string >( "ID" ), Amount = 900.23 }; DataGridView1.DataSource = result.ToList(); } private void MethodSyntax(DataTa...

Good day! A question was raised on how to assign a date value with format dd-MM-yyyy (05-11-2016) to a DateTimePicker control Text property. Using Convert.ToDateTime() to assign the given value will cause an exception String was not recognized as a valid DateTime . So, a workaround for this is to parse the date value using DateTime.ParseExact() as presented below. The default format of the DateTimePicker control is long. var dateObj = DateTime.ParseExact( "05-11-2016" , "dd-MM-yyyy" , CultureInfo.InvariantCulture); DateAttendancePicker.Text = dateObj.ToString(); Make sure that the second parameter of the function is the correct format of the input value.

Good day to all! Here's an example of how to perform a combobox lookup or cascade using two DataGridViewComboBoxColumns inside a DataGridView control Combo Lookup in DGV . The solution presented is in VB.NET, so I decided to create a C# equivalent for this. In form load event, populate two DataTables for Roles and Employees. Each employee is assigned to a specific role. private void Form1_Load( object sender, EventArgs e) { DataGridView1.Rows.Add(); dtRole.Columns.Add( "RoleID" ); dtRole.Columns.Add( "RoleName" ); dtRole.Rows.Add(1, "Admin" ); dtRole.Rows.Add(2, "Instructor" ); dtRole.Rows.Add(3, "Utility" ); dtEmployee.Columns.Add( "RoleID" ); dtEmployee.Columns.Add( "EmployeeID" ); dtEmployee.Columns.Add( "EmployeeName" ); dtEmployee.Rows.Add(1, 1, "Sam" ); dtEmployee.Rows.Add(1, 2, "Nicole" ); dtEmployee.Rows.Add(2, 3, "Donald" ); dtEmployee.Rows.Add(...

Hi, When adding DataGridViewComboBoxColumn control to a DataGridView control, the dropdown shows when you double click instead of single click. The common fix to this is to set the EditMode property to EditOnEnter . Given that you don't want to alter the default settings of the DataGrid control and you want to handle it through code,I found the solution in this website DATAGRIDVIEWCOMBOBOXCOLUMN REQUIRES MULTIPLE CLICKS TO SELECT AN ITEM from a comment made by a developer. However, there's a slight issue in the code provided since a column index returned might have a -1 index and this will cause an Unhandled Exception . The revision made is to add a condition that will check if the ColumnIndex of the DataGridView cell is greater than or equal to 0. private void DataGridView1_CellClick( object sender, DataGridViewCellEventArgs e) { DataGridView grid = (DataGridView)sender; if (e.ColumnIndex >= 0) { if (grid.Columns[e.ColumnIndex].Name == "Role" || grid....

Hi, Here's how to login to your facebook account using Webbrowser control and LINQ in Windows Forms. The input elements are checked through their attributes like "email" for email fields, "password" for password fields and "submit" for submission control. These codes are inside the DocumentCompleted event. C# code WebBrowser1.Document.GetElementsByTagName( "input" ).Cast<HtmlElement>().FirstOrDefault(t => t.GetAttribute( "type" ) == "email" ).SetAttribute( "value" , "your email address" ); WebBrowser1.Document.GetElementsByTagName( "input" ).Cast<HtmlElement>().FirstOrDefault(t => t.GetAttribute( "type" ) == "password" ).SetAttribute( "value" , "your user name" ); WebBrowser1.Document.GetElementsByTagName( "input" ).Cast<HtmlElement>().FirstOrDefault(t => t.GetAttribute( "type" ) == "submit" ).I...

Hello, I encountered this issue several weeks ago and decided to put the solution here. This pertains to inline-block elements not occupying the entire width of the container. Each element's width is set using percentage instead of pixels. After doing some research, I found a solution here: Display Inline-Block with Widths as Percent with the solution to set the font-size of the container element to 0 and add style box-sizing to border-box. For the child elements, set the default font size. CSS Code .container { margin : 0 0 1em 0; border : 2px solid black; padding : 1em; font-size : 0; box-sizing: border -box; } nav { vertical-align : top ; display : inline - block ; width : 25%; word-wrap: break-word; background-color : lightgray; font-size : 16px; } .column { vertical-align : top ; ...

Hi, There was a question raised on how to set the WPF DataGrid RowBackground with AlternationCount (alternating row colors) and DataTriggers without overriding the Alternation count. The fix is to declare a DataGrid.Style that contains settings for RowBackGround and AlternationCount. And in your DataGrid.RowStyle, define the DataTriggers to highlight RowBackground based on a given Value. <DataGrid x:Name= "dgEmployees" HorizontalAlignment= "Left" Margin= "0,0,0,0" VerticalAlignment= "Top" Height= "346" RowHeaderWidth= "0" AutoGenerateColumns= "False" CanUserAddRows= "False" CanUserResizeColumns= "False" CanUserDeleteRows= "False" ScrollViewer.CanContentScroll= "True" VerticalScrollBarVisibility= "Visible" HeadersVisibility= "Column" IsReadOnly= "True" > <DataGrid.Res...

Hi all, In this demo, I have dummy XML files saved to an XML column in a table. The files have the same structure of nodes, except that some files have altered price value of 104.95. The is the structure of the dummy XML file. <catalog> <book id= "bk101" > <author>Gambardella, Matthew</author> <title>XML Developer's Guide</title> <genre>Computer</genre> <price>44.95</price> <publish_date>2000-10-01</publish_date> <description> An in-depth look at creating applications with XML. </description> </book> <book id= "bk102" > <author>Ralls, Kim</author> <title>Midnight Rain</title> <genre>Fantasy</genre> <price>5.95</price> <publish_date>2000-12-16</publish_date> <description> A former architect battles corporate zombies, an ev...