this.Page.ClientScript.RegisterClientScriptBlock(this.GetType(), "alert", "<script type=text/javascript >alert(货品类型名称不能为空！')</script>");
为什么不能弹出窗口呢？
------解决方案--------------------------------------------------------
this.Page.ClientScript.RegisterClientScriptBlock(this.GetType(), "alert", " <script type=text/javascript >alert('货品类型名称不能为空！'); </script>");
你少了单引号了.最好加上分号.
------解决方案--------------------------------------------------------
if(!this.Page.ClientScript.IsRegisterClientScriptBlockered("alert"))
{
this.Page.ClientScript.RegisterClientScriptBlock(this.GetType(), "alert", " <script language='javascript' >alert(货品类型名称不能为空！') </script>");
}