Word interop problem : String parameter too long.

Thanks

i've changed your code as follow :

 private static void FindAndReplaceLargeContent2(Microsoft.Office.Interop.Word.Application wordApp, object strSearch, object strReplace)
        {
            object missing = System.Reflection.Missing.Value;
            object foward = true;
            Microsoft.Office.Interop.Word.WdFindWrap wrapFind = Microsoft.Office.Interop.Word.WdFindWrap.wdFindStop;
            object wrapExecute = Microsoft.Office.Interop.Word.WdReplace.wdReplaceAll;

            List<string> subs = new List<string>();
            int counter = 0;
            while (counter <= strSearch.ToString().Length)
            {
                if (strSearch.ToString().Length < counter + 250)
                {
                    subs.Add(strSearch.ToString().Substring(counter, strSearch.ToString().Length - counter));
                }
                else
                {
                    subs.Add(strSearch.ToString().Substring(counter, 250) + "#r#");
                }
                counter += 250;
            }
            wordApp.Selection.Range.Find.ClearFormatting();
            wordApp.Selection.Range.Find.Replacement.ClearFormatting();
            wordApp.Selection.Range.Find.Text = strSearch.ToString();
            wordApp.Selection.Range.Find.Wrap = wrapFind;
            wordApp.Selection.Range.Find.Replacement.Text = subs[0];
            wordApp.Selection.Range.Find.Execute(ref strSearch, ref missing, ref missing, ref missing, ref missing, ref missing,
                    ref missing, ref missing, ref missing, ref strReplace, ref wrapExecute, ref missing, ref missing, ref missing,
                    ref missing);
            wordApp.Selection.Range.Find.Text = "#r#";
            for (int i = 1; i < subs.Count; i++)
            {
                wordApp.Selection.Range.Find.Replacement.Text = subs[i];
                wordApp.Selection.Range.Find.Execute(ref strSearch, ref missing, ref missing, ref missing, ref missing, ref missing,
                    ref missing, ref missing, ref missing, ref strReplace, ref wrapExecute, ref missing, ref missing, ref missing,
                    ref missing);
            }
        }

but still i'm facing the same problem!!!!

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http://www.codeproject.com/KB/codegen/DatabaseHelper.aspx