/// 
    /// 获取、绑定、校验控件值的操作方法类    /// 
    public class ControlHelper    {        /// 
        /// 文本框不能为空值        /// 
        /// 文件框控件ID        /// 文本框控件名称        /// 
             public static string GetErrorMessage(TextBox txt, string txtName)        {            if(txt.Text.Trim() == string.Empty)                return string.Format("
{0}不能为空值！
", txtName);            else                return string.Empty;        }        /// 
        /// 文本框不能为空值且不能超过允许字符        /// 
        /// 文本框控件ID        /// 文本框控件名称        /// 最大长度        /// 
             public static string GetErrorMessage(TextBox txt, string txtName, int maxLength)        {            if(txt.Text.Trim() == string.Empty || txt.Text.Trim().Length > maxLength)                return string.Format("
{0}不能为空值且不能超过{1}个字符！
", txtName, maxLength);            else                return string.Empty;        }        /// 
        /// 文本控件值校验类型        /// 
        public enum TextValueType        {            /// 
            /// int 类型，包括负数            /// 
            Int,            /// 
            /// 小数类型            /// 
            Decimal,            /// 
            /// 整形数字类型            /// 
            Numeric        }        /// 
        /// 检查文本框必须为数字        /// 
        /// 文本框控件ID        /// 文本框控件名称        /// 是否为Int数字值，否则为小数值        /// 是否必须输入        /// 
             public static string GetErrorMessage(TextBox txt, string txtName, TextValueType tvt, bool isRequire)        {            if(isRequire && txt.Text.Trim() == string.Empty)                return string.Format("
{0}不能为空值！
", txtName);            switch(tvt)            {                case TextValueType.Int:                    if(!Validator.IsInt(txt.Text.Trim()) && txt.Text.Trim() != string.Empty)                        return string.Format("
{0}的值必须为Int型数字！
", txtName);                    break;                case TextValueType.Decimal:                    if(!Validator.IsDecimal(txt.Text.Trim()) && txt.Text.Trim() != string.Empty)                        return string.Format("
{0}的值必须为数字或小数且不能为负数！
", txtName);                    break;                case TextValueType.Numeric:                    if(!Validator.IsNumeric(txt.Text.Trim()) && txt.Text.Trim() != string.Empty)                        return string.Format("
{0}的值必须为整型数字！
", txtName);                    break;            }            return string.Empty;        }        /// 
        /// 检验下拉框必须选择索引大于第一项的值        /// 
        ///         ///         /// 
             public static string GetErrorMessage(DropDownList ddl, string ddlName)        {            if(ddl.SelectedIndex <= 0)                return string.Format("
请选择{0}！
", ddlName);            else                return string.Empty;        }        /// 
        /// 检验多项单选框必须选择        /// 
        ///         ///         /// 
             public static string GetErrorMessage(RadioButtonList rbl, string rblName)        {            if(rbl.SelectedIndex == -1)                return string.Format("
请选择{0}！
", rblName);            else                return string.Empty;        }        /// 
        /// 只允许上传图片        /// 
        ///         ///         /// 
             public static string GetErrorMessage(FileUpload upload, string fuName)        {            if(upload.HasFile)            {                if(upload.PostedFile.ContentType.ToString().ToLower().IndexOf("image") == -1)                    return string.Format("
上传的{0}文件格式不正确！
", fuName);            }            return string.Empty;        }        /// 
        /// 获得文本框的数字值        /// 
        /// 文本框控件        /// 
             public static int GetIntValue(TextBox txt)        {            if(txt.Text.Trim() == string.Empty)                return 0;            try            {                return Convert.ToInt32(txt.Text.Trim());            }            catch            {                return 0;            }        }        /// 
        /// 获得下拉控件选择项索引大于0的Int值        /// 
        ///         /// 
             public static int GetIntValue(DropDownList ddl)        {            if(ddl.SelectedIndex > 0)                return Convert.ToInt32(ddl.SelectedValue);            else                return 0;        }        /// 
        /// 获得文本框的小数值        /// 
        /// 文本框控件        /// 是否为小数        /// 
             public static decimal GetDecimalValue(TextBox txt)        {            if(txt.Text.Trim() == string.Empty)                return 0;            try            {                return Convert.ToDecimal(txt.Text.Trim());            }            catch            {                return 0;            }        }        /// 
        /// 返回从CheckBoxList中选定的单个或多个值        /// 
        /// CheckBoxList控件名称        /// 
     
      返回选定的值
             public static string GetValue(CheckBoxList cbl)        {            string result = string.Empty;            for(int i = 0; i < cbl.Items.Count; i++)            {                if(cbl.Items[i].Selected == true)                    result += String.Format(",{0}", cbl.Items[i].Value);            }            if(result != string.Empty)                result = result.Substring(1, result.Length - 1);            return result;        }        /// 
        /// 从CheckBoxList中选定        /// 
        /// CheckBoxList控件名称        /// 要选中项值，多个值以,号间隔        public static void BindValue(CheckBoxList cbl, string val)        {            Array.ForEach(val.Split(','),            delegate(string s)            {                for(int i = 0; i < cbl.Items.Count; i++)                    if(cbl.Items[i].Value == s)                        cbl.Items[i].Selected = true;            });        }        /// 
        /// 从单选项中选定        /// 
        /// RadioButtonList控件名称        /// 要选定的值        public static void BindValue(RadioButtonList rbl, string val)        {            for(int i = 0; i < rbl.Items.Count; i++)            {                if(rbl.Items[i].Value == val)                    rbl.Items[i].Selected = true;            }        }    }