Winform form, drop down list update data issue

Write this when popping up a modal window.

form2frm

newform2();

if( just refresh it here.

Write this sentence when the second form is closed.

To add: if form2

frm=new

form2 (control name).

If you want to have arguments, you need to override the constructor of the second form.

public

form2(control type.

control name 1) {

Control name = control name 1;

initializecomponent();

It's best to write a separate function for the part that updates the data, such as loadcombobox() dropdown 1().

string value = ;

loadcombobox（）;Update.

value;

dropdown_2()

string value = ;

loadcombobox（）;Update.

value;

。 。Learn two departure events. 。Wouldn't it be nice to have a drop down event and start one?

Change the loading status of the subform.

That is, maximize the subform as soon as it loads.

I don't understand what you mean.

Friend: The selectedindex attribute should be set;

You join under formload.

selectedindex = 0;

That's it,

First, get the data ID and bind it to the combobox, get the currently displayed data ID in the value change event of the combobox, then query the database according to the id, and finally display it.

I'm testing fine here.,You're having a problem.。

It should be your combox's problem.

I can't see the problem with this little bit, it should be a problem.

Difference 1One can format cells, while the latter is difficult to set.

Difference 2Usually one does not have an option icon, and the other does.

Difference 3The latter one belongs to the object and can be moved anywhere.

Difference 4The latter requires that the content be locked.

Difference 5The timing and use of the use are different.

And so on the difference 6The latter resize cells to change the size of the object.

You need to add two columns of c and d as parameters.

a b c d

1 (Combo box) (Auto display**) Product **.

2 Sofa 3000

3 beds 2000

4 tables 1000

Right-click the combo box in A1, select Format Control, and enter $c$2:$c$100 in Data Source Area, and $a$1 in Cell Link.

Enter =vlookup(a1,$c$2:$d$100,2,) in cell B1

In this way, after selecting "sofa" in the drop-down list of the combo box in A1, ** "3000" yuan will be automatically displayed in cell B1.

I don't understand your question, is the cell formatted as text.

index(a1:d11,4,3)

Shows the contents of the cell at the intersection of row 4 and column 3 (i.e., C4) in the range of cells A1 to D11.

If you want to save the data of the two cases of "sofa" and "3000 yuan" in the two columns of the supervision, you can hide these two columns. Then in the case of b1 we use the function "lookup(parameter 123...).That's it.

If you don't know how to use lookup in excel, go search or see help.

First, set the modifier property of the lable control to public in the form with the lable control

The button response function in form1 with button and textbox1 is:

private void button1_click(object sender, eventargs e)

After running, enter the characters in textbox1 and click the button and it's OK.

The modifier property of the lable control in form1 is set to publicform1 for the button event.

private void button1_click(object sender, eventargs e)

form2.

private void button1_click(object sender, eventargs e)

You can customize a static variable. There is also a tag with the form. Keep it simple.

Change|The constructor of form1 takes one argument.

Button events can be passed to new form1.

Add the command to the button in form2: and that's it.