如何快速清除所有TextBox的值

C#代码

public static void SetControlReadOnly(Control ctr)
        {
            if (ctr is TextBox)
            {
                TextBox txtControl = (TextBox)ctr;
                txtControl.ReadOnly = true;
                txtControl.Enabled = false;

            }
            else if (ctr is RadioButton) { RadioButton btn = (RadioButton)ctr;
                btn.Enabled = false;

            }
            else if (ctr is Button)
            {
                Button btn = (Button)ctr;
                btn.Enabled = false;

            }
            else if (ctr is FileUpload)
            {
                FileUpload btn = (FileUpload)ctr;
                btn.Enabled = false;

            }  
            else if (ctr is RadioButtonList)
            {
                RadioButtonList btn = (RadioButtonList)ctr;
                btn.Enabled = false;
            }

            else if (ctr is CheckBox)
            {
                CheckBox cb = (CheckBox)ctr;
                cb.Enabled = false;
            }
            else if (ctr is CheckBoxList)
            {
                CheckBoxList cb = (CheckBoxList)ctr;
                cb.Enabled = false;
            }
            else if (ctr is DropDownList)
            {
                DropDownList list = (DropDownList)ctr;
                list.Enabled = false;
            }

            else if (ctr is HtmlTextArea)
            {
                HtmlTextArea cb = (HtmlTextArea)ctr;
                cb.Attributes.Add("readonly", "");
                cb.Disabled = true;
            }
            else if (ctr is HtmlSelect)
            {
                HtmlSelect rb = (HtmlSelect)ctr;
                rb.Disabled = true;
            }

            else if (ctr is HtmlInputCheckBox)
            {
                HtmlInputCheckBox rb = (HtmlInputCheckBox)ctr;
                rb.Disabled = true;
            }
            else if (ctr is HtmlInputRadioButton)
            {
                HtmlInputRadioButton rb = (HtmlInputRadioButton)ctr;
                rb.Disabled = true;
            }
            else if (ctr is HtmlInputText)
            {
                HtmlInputControl input = (HtmlInputControl)ctr;
                input.Attributes.Add("readonly", "");
                input.Disabled = true;
            }
             else if (ctr is HtmlInputFile)
            {
                HtmlInputFile input = (HtmlInputFile)ctr;
                input.Attributes.Add("readonly", "");
                input.Disabled = true;
            }
               
            else
                foreach (Control ctr1 in ctr.Controls)
                {
                    SetControlReadOnly(ctr1);
                }
        }

JS代码

因为textbox和HtmlInputText在客户端生成出来就是textarea和input[type=text]，只要用js清除这两种标签的值就可以了

document.getElementsByName('text')