combobox error occured

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Hi,
I have two combo_box one of them fill whit font and another one fill whit font size
when i run program say this error:

Value of '0' is not valid for 'emSize'. 'emSize' should be greater than 0 and less than or equal to System.Single.MaxValue.
Parameter name: emSize

font combobox:

C#

private void fontComboBox1_SelectedIndexChanged(object sender, EventArgs e)
       {
           richtextbox1.SelectionFont=newFont(fontComboBox1.Text,Convert.ToInt32(cmbSize.SelectedItem));
       }

font size combobox:

C#

private void cmbSize_SelectedIndexChanged(object sender, EventArgs e)
        {
            richtextbox1.SelectionFont=newFont(fontComboBox1.Text,Convert.ToInt32(cmbSize.SelectedItem));
        }

and error occurred for this line in font combobox:

richtextbox1.SelectionFont=newFont(fontComboBox1.Text,Convert.ToInt32(cmbSize.SelectedItem));

Posted 3-Oct-12 2:02am

amirmohamad

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2 solutions

Solution 1

'emSize' is the font size. The font size 0 is unspecified, and then you'll get an error.

Posted 3-Oct-12 2:06am

Thomas Daniels

Comments

amirmohamad 3-Oct-12 8:11am

have i can set default size to my font size combobox

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mr.priyank · Accepted Answer · 2012-10-03T02:12:00

The error has no relation with combobox.

the error message clearly says the

VB

emSize

that is second param to the font constructor should be from 0 to System.Single.MaxValue

so put a check for

C#

cmbSize.SelectedItem

before line

C#

richtextbox1.SelectionFont=newFont(fontComboBox1.Text,Convert.ToInt32(cmbSize.SelectedItem));.

var FontSize = Convert.ToInt32(cmbSize.SelectedItem);
if (0 < FontSize && FontSize < System.Single.MaxValue )
{
richtextbox1.SelectionFont=newFont(fontComboBox1.Text,Convert.ToInt32(cmbSize.SelectedItem));.


}
else
{
// show error msg for in correct size
}