Alert Msg In C#

  string msg = InsertEmployee(1,txtName.Text);

 ScriptManager.RegisterStartupScript(this,this.GetType(),"", "alert('" + msg + "');window.location.href=('Default.aspx');", true);




ScriptManager.RegisterStartupScript(this, this.GetType(), "alertmessage", "javascript:alert('Please Enter Data')", true);



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 Page.ClientScript.RegisterStartupScript(this.GetType(), "", "alert('Insufficient Access Previlage');window.location.href=('LogiPage.aspx');", true);

ClientScript.RegisterStartupScript(GetType(), "alert", "alert('" + msg + "');window.location.href='InsertPage.aspx';", true);
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 ScriptManager.RegisterStartupScript(this, this.GetType(), "", "alert('" + msg + "');", true);     
                 //ScriptManager.RegisterStartupScript(this, this.GetType(), "", "alert('" + msg + "');window.location.href=('Default.aspx');", true);     
                ScriptManager.RegisterStartupScript(this,this.GetType(),"","alert('ddddddddd');", true);