What is the best way to remove duplicates from a datatable?

Question

I have checked the whole site and googled on the net but was unable to find a simple solution to this problem.

I have a datatable which has about 20 columns and 10K

Answer 1

This is a very simple code which doesnot require linq nor individual columns to do the filter. If all the values of columns in a row are null it will be deleted.

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    public DataSet duplicateRemoval(DataSet dSet) 
{
    bool flag;
    int ccount = dSet.Tables[0].Columns.Count;
    string[] colst = new string[ccount];
    int p = 0;

    DataSet dsTemp = new DataSet();
    DataTable Tables = new DataTable();
    dsTemp.Tables.Add(Tables);

    for (int i = 0; i < ccount; i++)
    {
        dsTemp.Tables[0].Columns.Add(dSet.Tables[0].Columns[i].ColumnName, System.Type.GetType("System.String"));
    }

    foreach (System.Data.DataRow row in dSet.Tables[0].Rows)
    {
        flag = false;
        p = 0;
        foreach (System.Data.DataColumn col in dSet.Tables[0].Columns)
        {
            colst[p++] = row[col].ToString();
            if (!string.IsNullOrEmpty(row[col].ToString()))
            {  //Display only if any of the data is present in column
                flag = true;
            }
        }
        if (flag == true)
        {
            DataRow myRow = dsTemp.Tables[0].NewRow();
            //Response.Write("");
            for (int kk = 0; kk < ccount; kk++)
            {
                myRow[kk] = colst[kk];         

                // Response.Write("" + colst[kk] + "");
            }
            dsTemp.Tables[0].Rows.Add(myRow);
        }
    } return dsTemp;
}

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This can even be used to remove null data from excel sheet.