Daily micro-tips for C#, SQL, performance, and scalable backend engineering.
Null coalescing: The null coalescing operator “??” uses two question marks. With it you can use a custom value for a null reference variable. It simplifies null tests. C# program that uses null coalescing operator using System; class Program { static string _name; /// <summary> /// Property with custom value when null. /// </summary> static […]
To develop reusable, reliable, readable, well-structured, and maintainable application, we must follow the coding standard. There are several coding practices in the software industry. None of them are good or bad but the main thing is that whatever approach we follow, we should make sure that everyone should follow the same standard.
By using the params keyword, you can specify a method parameter that takes a variable number of arguments. You can send a comma-separated list of arguments of the type specified in the parameter declaration or an array of arguments of the specified type. You also can send no arguments. If you send no arguments, the length of the params list is […]
The following code shows how to group by two columns (“Country” and “City”).
Response.Redirect(URL, false): The client is redirected to a new page and the current page on the server will keep processing ahead. Response.Redirect(“default.aspx”, false); Response.Redirect(URL, true): The client is redirected to a new page, but the processing of the current page is aborted. Response.Redirect(“default.aspx”, true);
DevExpress.Web.ASPxClasses.ASPxWebControl.RedirectOnCallback(“the_redirect_page.aspx”);
You can add HiddenField to the Gridview like that:
using System; using System.Web.UI; using System.Collections.Specialized; public partial class _Default : Page { protected void Page_Load(object sender, EventArgs e) { NameValueCollection headers = base.Request.Headers; for (int i = 0; i < headers.Count; i++) { string key = headers.GetKey(i); string value = headers.Get(i); base.Response.Write(key + ” = ” + value + “<br/>”); } } }
You can use both methods: DateTime.Now.Day.ToString(“00”); DateTime.Now.ToString(“dd”);
drpList.Items.Insert(0, new ListItem(String.Empty, String.Empty)); drpList.SelectedIndex = 0;
protected void GridView_RowDataBound(object sender, GridViewRowEventArgs e) { e.Row.Cells[index].Visible = false; }
myComboBox_SelectedIndexChanged(myComboBox, new EventArgs()); // or (null, null)