protected void TextBox11_TextChanged(object sender, EventArgs e) { if((!string.IsNullOrEmpty(TextBox6.Text)) && (!string.IsNullOrEmpty(TextBox7.Text)) && (!string.IsNullOrEmpty(TextBox8.Text)) && (!string.IsNullOrEmpty(TextBox9.Text)) && (!string.IsNullOrEmpty(TextBox10.Text)) && (!string.IsNullOrEmpty(TextBox11.Text))) { TextBox12.Text = (Convert.ToInt32(TextBox6.Text) + Convert.ToInt32(TextBox7.Text)) + (Convert.ToInt32(TextBox8.Text) + Convert.ToInt32(TextBox9.Text)) + (Convert.ToInt32(TextBox10.Text) + Convert.ToInt32(TextBox11.Text)).ToString(); } }
var
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