CATDOLL : CATDOLL: How to add database content to a text box based on changes in a combo box in C#

1. How to add database content to a text box based on changes in a combo box in C#

When there are two items in your listbox:

textBox1.Text = listBox1.Items[0].ToString();

textBox1.Text += listBox1.Items[1].ToString();

If there are multiple, you can use a loop

I tried this code, it works fine

2. How to assign a value to a combo box in the VBA code editor in Excel? Don't use the value of a specified cell. What I need is to assign a value to a combo box in Excel.

Use additem in the workbook_open event. If your combo box is in a form, replace sheet1 with userform1:

Private Sub Workbook_Open()

Sheet1.ComboBox1.AddItem (1)

Sheet1.ComboBox1.AddItem (2)

Sheet1.ComboBox1.AddItem (3)

Sheet1.ComboBox1.AddItem (4)

End Sub

3. How to read multiple data in Easy Language combo box

.Version 2 .Assembly windowAssembly 1 .Subroutine __Startup window_ is created.Local variable a, integer type.Local variable item value, integer type.Local variable item text, text type.Local variable item value to be found, integer type item value to be found = 8 .Counting loop start (combo box 1.Get item number(), a) Item value = combo box 1.Get item value (a - 1) .If true (item value = item value to be found) Item text = combo box 1.Get item text (a - 1) combo box 1.Select (item text) .If true end.Counting loop end ()

IV. About the combo box design problem in VB

Use an array or query database to find all the colleges and universities in the province. Then clear the contents of the second combo box. Then add the colleges and universities one by one.

This type of programming is best associated with a database. When the first combo box changes the selection, query the database to change the content of the second combo box.

Access can. You set up two fields, one for the province name and one for the school name. Put the data you want in there.

In addition, there is also knowledge about VB connecting and accessing databases and knowledge about SQL querying databases. If you don't know either of these, it's best to look up relevant information on the Internet.