How to do validation for the grid?

var gv = document.getElementById("gridViewID");

var exists = false;
var ddlNewsSector = document.getElementById("ddlNewsSector");
var ddlNewsSectorType = document.getElementById("ddlNewsSectorType");
for(var i = 1; i< gv.rows.length; i++)
{
      var  tr = gv.rows[i];
      var NewsSector = tr.cells[0];
      var NewsSectorType = tr.cells[1];
      
      if(NewsSector.innerHTML == ddlNewsSector.Items[ddlNewsSector.SelectedIndex].value
            && NewsSectorType.innerHTML == ddlNewsSectorType.Items[ddlNewsSectorType.SelectedIndex].value
        )
        {
            exists = true;
            break;
        }
}

if(exists == true)
{
      alert("Record already exists");
      return false;
}
else
       return true;

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