how to access each cell of a table of word document in c#

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C#

C#4.0

hello,
my query is that i'm using this code to get each cell of a table of a word document

foreach (word.Table tables in doc.Tables)
            {
                int r = tables.Rows.Count;
                for (int i = 1; i <= r; i++)
                {
                    foreach (word.Cell cell in tables.Rows[i].Cells)
                    {
                        //any code
                    }
                }                
            }

bt it's showing error if any cell in table is merged...
i want to replace text of each cell with some other text...
plz help me with this