c# Get selected item text from combobox

C# Combobox defined with name my_combobox
private System.Windows.Forms.ComboBox my_combobox;

Read the text of the selected combobox item and assign it to string variable, then show it in message box.
string selected_item_text = my_combobox.GetItemText(my_combobox.SelectedItem); MessageBox.Show(selected_item_text);

2017/10/18 06:03

Deploy ASP .NET MVC application using LocalDB to local IIS

When ASP application is published to IIS using LocalDB accessing the database may result in the following error:
Server Error in '/Application_Name' Application.A network-related or instance-specific error occurred while establishing a connection to SQL Server.
2017/10/18 05:49

c# combobox fill from database

| 2017/10/05 03:18
To get only the unique /distinct/ data table records from any database connected to DataSet in C# project and to put them inside combobox.Fill the table adapter with the records from database.
Create a view containing the database table
DataView view = new DataView(this.myDB_DataSet.myDBTable);

Copy only the distinct records to new data table.

Get latest date record - SQL query

| 2017/10/05 03:02
To return the latest record (one record only) from data base table where one of the fields is in Date/Time format:
SELECT TOP 1 * FROM table_name ORDER BY date_time_column_name DESC

c# combobox set selected item by item's text

| 2017/10/05 02:52
C# Combobox defined with name my_combobox
private System.Windows.Forms.ComboBox my_combobox;

Define string variable with the text of the combobox item that has to be selected. For example, if the combobox items have text values "item_a" "item_b" "item_c" ... and the item which text is "item_b" has to be selected

C# - Get database connection string from Web.config file

| 2017/10/05 02:45
To get the database connection string from IIS Web.config file using C# code, include System.Configuration directive and then create a string variable to assign the connection string like this:
using System.Configuration;
string connStr = ConfigurationManager.

C# Textbox - enter only positive numbers on KeyPress event in Windows form application

To prevent users from entering incorrect data in Windows form application, set restriction to allow only specific characters to be entered in the text box.This example uses KeyPress event to monitor the users input and to apply the restriction required.To avoid code duplication in Windows multiform applications for example, a separate class file is created “CommonFunctions.cs”.
The function to allow only numbers in textbox control is named InputNumbers.
For each Windows form, create a single KeyPress event and call the InputNumbers function inside it.
| |
2017/10/05 02:27

c# passing data between forms

C# project with two forms
public partial class Form1 : Form // this is the main form

public partial class Form2 : Form // this is the second form
To pass variables (values, data) from Form1 to Form2
Case: public variables in Form2
public string input_variable; // put this in Form2 as global variable

public string output_variable; // put this in Form2 as global variable

in Form1 inside the function that run (call) Form2
2017/10/05 02:07

C# How to draw shapes – Circle, Rectangle, Arc, Pie, Polygon, Bezier, Text

In order to draw shapes in C# a start point and end point coordinates, and a Pen control must be defined first.
Coordinates in C#The value of x is the location of the point along the x-axis, the 0 is at the extreme left. The value of y is the location of the point along the y-axis, the 0 is at the extreme top.
| |
2017/10/05 01:56

C# - How to add reference to project

To add a reference to CSharp project do the following:
  1. Open “Solution Explorer”;
  2. Right click “References”;
  3. Choose “Add Reference”.

On the Reference Manager Window go to: “Assemblies” -> “Framework”.
2017/10/05 01:31

C# Custom control – TextBox accepting only numbers, decimal numbers, signed numbers

The creation of custom control using Visual Studio involves the following steps:
  1. Start Visual Studio;
  2. Create new “Windows Control Library” project;
  3. In the created project delete “User Control” file;
  4. Go to “Project” > “Add User Control” and give it a name;
  5. Change the inherited class to this that you want your control to be;
  6. Create you custom properties for the control;
    | |
    2017/10/05 00:51