Replacing of text is not working in word documnt after inserting a table using Openxml

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OpenXML

Hi All,

I have word document, and in that document i have a table and also some data.
My tasks are:
1) For that table i need to add some rows at the end of the table.
2) Replace some text in the word document(Not in the table), with some other text.

I have done both of them.
and here is my code.

For table:
-----------
DocumentFormat.OpenXml.Wordprocessing.TableRow theRow = tab.Elements<documentformat.openxml.wordprocessing.tablerow>().Last();
for (int i = 0; i < (rcount - 1); i++)
{
DocumentFormat.OpenXml.Wordprocessing.TableRow rowCopy = (DocumentFormat.OpenXml.Wordprocessing.TableRow)theRow.CloneNode(true);
for (int j = 0; j < Columncells.Count(); j++)
{
DocumentFormat.OpenXml.Wordprocessing.TableCell cell = rowCopy.Descendants<documentformat.openxml.wordprocessing.tablecell>().ElementAt(j);
DocumentFormat.OpenXml.Wordprocessing.Paragraph parg = cell.Elements<documentformat.openxml.wordprocessing.paragraph>().First();
DocumentFormat.OpenXml.Wordprocessing.Run r = parg.Elements<documentformat.openxml.wordprocessing.run>().First();
DocumentFormat.OpenXml.Wordprocessing.Text tex = r.Elements<documentformat.openxml.wordprocessing.text>().First();
tex.Text = tex.Text.Trim('1') + (i + 2);
if (j == 0 && i == 0)
{
rowCopy.Descendants<documentformat.openxml.wordprocessing.tablecell>().ElementAt(j).Append(new DocumentFormat.OpenXml.Wordprocessing.Paragraph(run));
}
else
{
rowCopy.Descendants<documentformat.openxml.wordprocessing.tablecell>().ElementAt(j).Append(new DocumentFormat.OpenXml.Wordprocessing.Paragraph());
}
}
tab.InsertBefore<tablerow>(rowCopy, theRow);
}

For replace of text:
--------------------

Regex regexText = new Regex("Helo");
docText = regexText.Replace(docText, "Hello");

Actually my problem is

By using the code which i used for table, replacing of the text in word document is not working, When i remove that part of code than, replace functionality is working fine.

Can anybody help me, at which place of the code it is preventing replace functionality.

Thanks in advance.