c = double.Parse(textBox21.Text)+ double.Parse(textBox22.Text); i = double .Parse (textBox23.Text); textBox31.Text = Convert.ToDouble(c + i ).ToString(); return;
double sum = 0; foreach (Control c in this.Controls) { if (c is GroupBox) { foreach (Control item in c.Controls) { if (item is TextBox) { sum += Convert.ToDouble(((TextBox)item).Text); } } } } MessageBox.Show(sum.ToString());
double sum=double.Parse(textBox21.Text)+ double.Parse(textBox22.Text)+double.Parse(textBox23.Text)+ double.Parse(textBox24.Text)+.............+double.Parse(textBox29.Text)+ double.Parse(textBox30.Text) textBox31.Text =sum.toString();
var
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