برخورد با ارور The settings property 'cmb' was not found.

[adineh67]

سلام
علت برخورد با این ارور چی میتونه باشه :The settings property 'cmb' was not found.

کد بخش setting:


public string cmb
{
get
{
return ((string)(this["cmb"]));
}
set
{
this["cmb"] = value;

}
}


کد بخش app.config:



<configSections>
<sectionGroup name="userSettings" type="System.Configuration.UserSettingsGroup, System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" >
<section name="test_TextBox.Properties.Settings" type="System.Configuration.ClientSettingsSection, System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" allowExeDefinition="MachineToLocalUser" requirePermission="false" />
</sectionGroup>
</configSections>
<userSettings>
<test_TextBox.Properties.Settings>
<setting name="cmb" serializeAs="String">
<value />
</setting>
</test_TextBox.Properties.Settings>
</userSettings>

کد بخش اجرا:



private void TXTvolt_KeyPress(object sender, KeyPressEventArgs e)
{
if (e.KeyChar==13)
{
if (!Properties.Settings.Default.cmb.Contains("," + TXTvolt.Text.TrimStart().TrimEnd().Trim() + ","))
{

Properties.Settings.Default.cmb += TXTvolt.Text.TrimStart().TrimEnd().Trim() + ",";
Properties.Settings.Default.Save();

}
TXTvolt.Items.Add(TXTvolt.Text);
}
}