System.Text.StringBuilder sbMessage = new StringBuilder(); sbMessage.Append("<script type=\"text/javascript\">"); sbMessage.Append("function alertMessage() {"); sbMessage.Append("alert(\"please select value from dropdownlist\");"); sbMessage.Append("}"); sbMessage.Append("</script>"); this.Page.RegisterClientScriptBlock("alerMessege", sbMessage.ToString());
this.Page.RegisterClientScriptBlock(this.GetType(), "alertMessage", sbMessage.ToString());
<script> function onButtonClick() { dropdown=document.getElementById("<%=ddlSelect.ClientID %>") if(dropdown.selectedIndex<0) { alert("Your msg"); return false; } return true; } </script>
var
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