How to Use ComboBox in Windows Forms

Here, I will explain how to use a combo box in a Windows application. Before this I explain how to delete selected data from the database.

Step 1: Registration form with a ComboBox

Drag and down a ComboBox and a button from the Toolbox and provide the name of the button as "Add string".

registration form with a combo box

Step 2: Code1

At first step I want that when I enter a name and click the Button (Add string) then that name shows in the ComboBox.
So click on the Add String button and write this code.
combo box
  1. private void Addstring_Click(object sender, EventArgs e)  
  2. {  
  3.     string namestr = Name_txt.Text;  
  4.     comboBox1.Items.Add(namestr);  

Step 3: Output for code1

When you enter a name in the TextBox and click on the button (add string). You will see that the name will show in the comboBox.

Step 4: Code2

Now if we want, when I click on any name in the ComboBox that the name shows in a TextBox. so now for the code for that. Click on the combo box and write this code. I want that selected name from the combo box shown in the Id TextBox.
  1. private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)  
  2. {  
  3.     Eid_txt.Text = comboBox1.text;  

Step 5: Output for code2

Now select any name in the ComboBox and that name will be shown in the Id TextBox.

You can also see this in my blog_munesh.