How Do I: Show the Selected Item on a ComboBox in my Sample?

Gustavo

Hello:

Below is my code. I do load the new value into the ComboBox, but I dont know how to have it show on the Form. The values that I load in the textBox is fine, but the ComboBox does not show what is loaded. Can someone tell me what I need to do on the line: //comboBox1.SelectedItem = TheOriginalValue; ?

private void textBox_ID_Validated(object sender, EventArgs e)
{
Control TheControlEvent = this.GetNextControl(null, true);
while (TheControlEvent != null)
{
TheEventType = TheControlEvent.GetType().Name;
TheEventName = TheControlEvent.Name;
TheEventValue = TheControlEvent.Text;
switch (TheEventType)
{
case "TextBox":
for (TheRow = 0; TheRow < dataGridViewRecord.Rows.Count - 1; TheRow++)
{
TheColumnValue = dataGridViewRecord.Rows[TheRow].Cells["Column"].Value.ToString();
TheOriginalValue = dataGridViewRecord.Rows[TheRow].Cells["TheOriginal"].Value.ToString();
if (TheEventName.Substring(7) == TheColumnValue)
{
TheControlEvent.Text = TheOriginalValue;
break;
}
}
break;
case "ComboBox":
for (TheRow = 0; TheRow < dataGridViewRecord.Rows.Count - 1; TheRow++)
{
TheColumnValue = dataGridViewRecord.Rows[TheRow].Cells["Column"].Value.ToString();
TheOriginalValue = dataGridViewRecord.Rows[TheRow].Cells["TheOriginal"].Value.ToString();
if (TheEventName.Substring(8) == TheColumnValue)
{
TheControlEvent.Text = TheOriginalValue;
//TheControlEvent.Refresh();
//comboBox1.SelectedItem = TheOriginalValue;
// NEEDS WORK TO SHOW: SelectedItem
break;
}
}
break;
default:
break;
}
TheControlEvent = this.GetNextControl(TheControlEvent, true);
}
}

6 Replies

Know the answer? Post it — somebody with the same question will find it here.

Christofel Hakim16y ago
Accepted answer
Hi,

Before your select the new item in combo box, you need to add the new item first into that combo box items.

comboBox1.Items.Add(TheOriginalValue); // add the item first
comboBox1.SelectedValue = TheOriginalvalue // then select it
Gustavo16y ago
Christofen:

With some things you said in the other posts, I have figured it out. Thanks.

I also had to do a change in my other routine to full make it work.

Thanks for leading me the correct direction.

((ComboBox)TheControlEvent).Items.Add(TheOriginalValue);
((ComboBox)TheControlEvent).Text = TheOriginalValue;
((ComboBox)TheControlEvent).SelectedIndex = 0;

I guess I had to do the ((ComboBox)TheControlEvent).SelectedIndex = 0; so it would show it in the Form. Then I had to use the ((ComboBox)TheControlEvent).Text in my other routine after I load all the selections.

Thanks
Christofel Hakim16y ago
If the combo box already load the new item, then you should try

((ComboBox)TheControlEvent).SelectedItem.Text = TheOriginalValue;
Gustavo16y ago
With the code I have... I have to use something like this:

((ComboBox)TheControlEvent).Items.Add(TheOriginalValue);
((ComboBox)TheControlEvent).SelectedValue = TheOriginalValue;

It does load it, but it does not show it on the ComboBox. I have to click and select it to show it for the first time.

Gustavo16y ago

Crish:

Thanks, but it does not work. I have to somehow define the ComboBox that its at.
Loading the TextBox with: TheControlEvent.Text = TheOriginalValue; Works.

But, loading the ComboBox doesnt.

 
private void textBox_ID_Validated(object sender, EventArgs e)
{
Control TheControlEvent = this.GetNextControl(null, true);
while (TheControlEvent != null)
{
TheEventType = TheControlEvent.GetType().Name;
TheEventName = TheControlEvent.Name;
TheEventValue = TheControlEvent.Text;
switch (TheEventType)
{
case "TextBox":
for (TheRow = 0; TheRow < dataGridViewRecord.Rows.Count - 1; TheRow++)
{
TheColumnValue = dataGridViewRecord.Rows[TheRow].Cells["Column"].Value.ToString();
TheOriginalValue = dataGridViewRecord.Rows[TheRow].Cells["TheOriginal"].Value.ToString();
if (TheEventName.Substring(7) == TheColumnValue)
{
TheControlEvent.Text = TheOriginalValue;
break;
}
}
break;
case "ComboBox":
for (TheRow = 0; TheRow < dataGridViewRecord.Rows.Count - 1; TheRow++)
{
TheColumnValue = dataGridViewRecord.Rows[TheRow].Cells["Column"].Value.ToString();
TheOriginalValue = dataGridViewRecord.Rows[TheRow].Cells["TheOriginal"].Value.ToString();
if (TheEventName.Substring(8) == TheColumnValue)
{
TheControlEvent.Text = TheOriginalValue; // This does not work
//
// NEEDS WORK TO SHOW: Selected Item
//
break;
}
}
break;
default:
break;
}
TheControlEvent = this.GetNextControl(TheControlEvent, true);
}
}

Crish16y ago
hi

try below code

comboBox1.Selectedvalue = TheOriginalValue

thanks