How do I save value in a variable from a comboBox

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I have used the following code in Microsoft Visual C# 2005 using Microsoft Visual Studio 2005 Professional Edition.

C#

private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
        {
            _selectedVolt = comboBox1.SelectedIndex;
        } 

private void comboBox1_TextChanged(object sender, EventArgs e)
        {
            volt = Convert.ToDouble(comboBox1.SelectedText);
        }

I have put the values (0.7, 0.8, 0.9) for comboBox in Items field of Property pallette in design-time.

Now please let me know the process of storing the value of the selected text from comboBox in a variable. When I'm doing arithmetic calculation with the value of 'volt' it takes no value in it.

Posted 17-Mar-15 0:19am

Member 11531798

Updated 17-Mar-15 0:30am

CHill60

v2

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Andy Lanng 17-Mar-15 6:34am

I'll try to answer but I'm not too sure what the issue is as the code you have does what you ask

2 solutions

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Andy Lanng · Answer 1 · 2015-03-17T00:34:00

Winforms:

C#

private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
{
            // The index of the selected Item
            var index = comboBox1.SelectedIndex;

            // The Text in a writable combobox.  Is is used for text suggestion etc
            var text = comboBox1.SelectedText;

            // The text or string value as it appears in the selected item
            var value = comboBox1.SelectedItem.Text

            // comboBox1.SelectedItem.ToString() calls comboBox1.SelectedItem.Text
            // This means that you can use the object comboBox1.SelectedItem for string
            // fields such as:
            var dValue = Convert.ToDouble(comboBox1.SelectedItem);
}

CHill60 · Answer 2 · 2015-03-17T00:39:00

Solution 2

If you put a breakpoint on the line

SQL

volt = Convert.ToDouble(comboBox1.SelectedText);

and hover your mouse over comboBox1.SelectedText you will discover that it is blank. Instead use

volt = Convert.ToDouble(comboBox1.SelectedItem);

Posted 17-Mar-15 0:39am