Miguel Flores Miguel Flores - 1 year ago 91
C# Question

How to get string value from combobox to double c#

I'm trying to create an application with C#, in this application I want to select Element1 and Element2, Element 1 and 2 are in a ComboBox, I fill the combobox with this function:

private void agregarItems()
comboBox1.DisplayMember = "Text";
comboBox1.ValueMember = "Value";

var items = new[] {
new { Text = "Li", Value = "6.941" },
new { Text = "Mg", Value = "24.305" }
comboBox1.DataSource = items;

That's ok, then I have a button, when I click this button I want to display the total of the sum of Element1 with Element 2.

For example: E1 = 6.941 and E2 = 6.941 Total = 13.882

What I'm trying is the following code:

private void sum()
double val1 = comboBox1.SelectedValue;
double val2 = comboBox2.SelectedValue;

var total = val1 + val2;

But I get the following error:

cannot convert from 'object' to 'string'

What I'm doing wrong and how can I solve it?

Answer Source

Your code it's fine just make this change:

private void sum()
     double val1 = Double.Parse(comboBox1.SelectedValue.ToString());
     double val2 = Double.Parse(comboBox2.SelectedValue.ToString());

    var total = val1 + val2;

I'll hope this help you

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