试试这个

 ClientScript.RegisterStartupScript（ typeof （页面），  MessagePopUp，  alert（'按摩'）;， true ）; 

ScriptManager.RegisterClientScriptBlock（this，this.GetType（），VariableRegisteration，strScript，true）;



如果在更新面板内验证

试试这个

 ScriptManager.RegisterStartupScript（ this ， this  .GetType（），  script，   alert（'Message'）;， true ）; 

hi I use these scripts for showing error msg.Scripts call proprly but msg not show in any browser..
here is scripts..

ClientScript.RegisterStartupScript(Page.GetType(), "fghh", "alert('Check Min% data, Min1% + Min2% + Min3% + Min4%  has to be equal to 100.');", true);

 ScriptManager.RegisterStartupScript(txt_Min4_Per, Page.GetType(), "", "alert('Check Min% data, Min1% + Min2% + Min3% + Min4%  has to be equal to 100.');", true);

how to solve this....

try this

ClientScript.RegisterStartupScript(typeof(Page), "MessagePopUp", "alert('Your Massage');", true);

ScriptManager.RegisterClientScriptBlock(this, this.GetType(), "VariableRegisteration", strScript, true);

use this if ur validation inside update panel

Try this

ScriptManager.RegisterStartupScript(this, this.GetType(), "script", "alert('Message');", true);