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Bind a dataset to a combo box in C#



dataset-combobox.jpg

The DataSet is a memory-resident representation of data that provides a consistent relational programming model regardless of the data source. The C# SqlDataAdapter object allows us to populate Data Tables in a DataSet. Also we can populate a combo box from a dataset values.

Bind data source to ComboBox

Select Item from ComboBox

The following C# program retrieve the values from database and store it in a dataset and later bind to a combobox.

Binding a ComboBox to an Enum values

C# how to bind combobox with Enum

Enum provide a convenient way in which to create a group of related constants that can be viewed as strings or integer values. When these values are bind to a ComboBox, the end user can select an option directly from a list of the Enum strings.

Data Binding an Enum with Descriptions

The follwoing C# program bind a combobox with Enum values.

Bind a ComboBox to a generic Dictionary

C# how to bind combobox with Dictionary

A Dictionary class is a data structure that represents a collection of keys and values pair of data. The key is identical in a key-value pair and it can have at most one value in the dictionary, but a value can be associated with many different keys.

Dictionary as a Combobox Datasource

The following C# program populating a Combobox from a Dictionary .






using System;
using System.Windows.Forms;
using System.Collections.Generic;


namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            MessageBox.Show(Convert.ToString(comboBox1.Text + " " +  comboBox1.SelectedValue));
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            var colors = new Dictionary < string, string > ();
            colors["10"] = "Red";
            colors["20"] = "Blue";
            colors["30"] = "Green";
            colors["40"] = "Yellow";
            comboBox1.DataSource = new BindingSource(colors, null);
            comboBox1.DisplayMember = "Value";
            comboBox1.ValueMember = "Key"; 

        }
    }
}





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