Diffrence b/w Convert.ToString() and .ToString()

Diffrence b/w Convert.ToString() and .ToString()

.ToString()………….

.ToString() does not handle null value.

string s = null;

      

 ScriptManager.RegisterClientScriptBlock(this, this.GetType(), "", "<script> alert('" + s.ToString() + "')</script>", false);

It’s Generates Error as Given Below:-

NullReferenceException was unhandled by user code

Convert.ToString ()

It’s handle null value.

string s = null;

      

 ScriptManager.RegisterClientScriptBlock(this, this.GetType(), "", "<script> alert('" +  Convert.ToString(s) + "')</script>", false);

It does Not  Generates Error