decimal Conversion Problems

Hello, I can't seem to get my code to work. I can't seem to display my values correctly after a conversion. It seems to be a rounding error. But nothing I have tried works. Any ideas? private void Calculate() { if(ActiveSelect == false) { dsPicked = null; decimal dRatio = 0; dsPicked = dsCherryPick.Clone(); //System.Text.StringBuilder sb = new StringBuilder(1024, 1024 * 5); //sb.Append("CAD IN ("); if(gridProperties.Selected.Rows.Count > 0) { foreach(Infragistics.Win.UltraWinGrid.UltraGridRow rw in gridProperties.Selected.Rows) { dsPicked.Tables[0].Rows.Add(Main.dsCherryPick.Tables[0].Rows.Find(rw.Cells["CAD"].Value).ItemArray); //sb.Append("'" + rw.Cells["CAD"].Text + "', "); } //sb.Append (" '1' )"); //System.Data.DataRow[] dr2 = Main.dsCherryPick.Tables[0].Select(sb.ToString(),"Ratio"); dsPicked.Tables[0].AcceptChanges(); dsPicked.Tables[0].DefaultView.Sort = "Ratio"; dsPicked = SortDS(dsPicked); if(Profile != "Vacant Land") { //int retMod = mod(dsPicked.Tables[0].Rows.Count,2); int iRowCnt = dsPicked.Tables[0].Rows.Count; int retMod = (dsPicked.Tables[0].Rows.Count % 2); if (retMod != 0) { dRatio = Convert.ToDecimal(dsPicked.Tables[0].Rows[iRowCnt/2]["Ratio"]); //dRatio = Math.Round(dRatio,3); txtRatio.Text = String.Format("{0:P}", dRatio); } else { //retMod = retMod - 1; decimal tempRatio = System.Convert.ToDecimal(dsPicked.Tables[0].Rows[iRowCnt/2]["Ratio"]); dRatio = System.Convert.ToDecimal(dsPicked.Tables[0].Rows[(iRowCnt/2)-1]["Ratio"]); //dRatio = Math.Round(dRatio,3); dRatio = (tempRatio + dRatio)/2; txtRatio.Text = String.Format("{0:P}",dRatio); } decimal d1 = Convert.ToDecimal(gridSubject.Rows[0].Cells["TotalPerSqft"].Value); //d1 = Math.Round(d1,3); txtMedPerSqft.Text = String.Format("{0:C}", d1 * dRatio); int d3 = System.Convert.ToInt32 (gridSubject.Rows[0].Cells["sqft"].Value); decimal d4 = d3 * (d1 * dRatio); txtSubjectProposed.Text = String.Format("{0:C}", d4); //txtMedPerSqft.Text = String.Format("{0:C}",System.Convert.ToDouble(txtMedPerSqft.Text)); dsTotals.Tables[0].Clear(); System.Data.DataRow drtotal = dsTotals.Tables[0].NewRow(); drtotal["Median"] = dRatio; //Shared.fixdecimal(txtRatio.Text); drtotal["MedAdjustSF"] = d4; //Shared.fixdecimal(txtMedPerSqft.Text); dsTotals.Tables[0].Rows.Add(drtotal); } } } }