How to display Alert in JavaScript and ASP.NET

below mention script how to write on button click with server side confirmation in asp.net

Response.Write("")

///

/// showAlert ///

public string showAlert(string msg) { string message = msg; System.Text.StringBuilder sb = new System.Text.StringBuilder(); sb.Append(""); return sb.ToString(); } and then call above function like ClientScript.RegisterClientScriptBlock(this.GetType(), "alert", showAlert("Student already admitted to this batch."));

page.registerstartupscript("sss","alert('student details not avlible')");

Page.RegisterStartupScript("ddd", "alert('student details not avalible')");

Page.RegisterStartupScript("ddd", "alert('student details not avalible')");

Response.Write("alert('Duplicate files not allowed');");

Response.Write("javascript:alert('Your message');");

we can display alert box from asp.net code-behind that is

1. ScriptManager.RegisterStartupScript(this,GetType(),"alertmsg","alert('hahahahah');",true);


 

You need to drag script manager and then type the follwing code wherever u required

ClientScript.RegisterClientScriptBlock(typeof(Page), "test", "");