一个c#的输入框函数

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private static string InputBox(string Caption, string Hint, string Default)        {            Form InputForm = new Form();            InputForm.MinimizeBox = false;            InputForm.MaximizeBox = false;            InputForm.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedDialog;            InputForm.StartPosition = FormStartPosition.CenterScreen;            InputForm.Width = 220;            InputForm.Height = 150;            InputForm.Text = Caption;            Label lbl = new Label();            lbl.Text = Hint;            lbl.Left = 10;            lbl.Top = 20;            lbl.Parent = InputForm;            lbl.AutoSize = true;            TextBox tb = new TextBox();            tb.Left = 30;            tb.Top = 45;            tb.Width = 160;            tb.Parent = InputForm;            tb.Text = Default;            tb.SelectAll();            Button btnok = new Button();            btnok.Left = 30;            btnok.Top = 80;            btnok.Parent = InputForm;            btnok.Text = "确定";            InputForm.AcceptButton = btnok;//回车响应            btnok.DialogResult = DialogResult.OK;            Button btncancal = new Button();            btncancal.Left = 120;            btncancal.Top = 80;            btncancal.Parent = InputForm;            btncancal.Text = "取消";            btncancal.DialogResult = DialogResult.Cancel;            try            {                if (InputForm.ShowDialog() == DialogResult.OK)                {                    return tb.Text;                }                else                {                    return null;                }            }            finally            {                InputForm.Dispose();            }        }
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