How to execute script in C# code example

Example: How to execute script in C#

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int NumberOfRows = oRSEntities.Menu_Item.Count();
string message = $" {NumberOfRows} Records saved successfully.";
string script = "window.onload = function(){ swal('";
script += message;
script += "')};";
ClientScript.RegisterStartupScript(this.GetType(), "SuccessMessage", script, true);