C Sharp Textbox shows "&nbsp ;"   for empty value

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C#

In the following code in the if function codes work for save if it does not find any data view. It it finds any dataviews then it goes to else portion and edit the data. But the problem is that when I want to see the text for remarks it shows " ". How can I get it empty value. I mean the txtRemark does not show any data.

private void SaveDataFotblMaintenancePlanDate()
    {
        DataTable DTLocal = null;
        DataView DVLocal = null;
        DataRow DRLocal = null;
        System.Web.UI.Page this_page_ref = null;
        string strSQL = null;

        try
        {
            DTLocal = new DataTable();
            DVLocal = new DataView();
            for (int i = 0; i < grdEdit.Rows.Count; i++)
            {
                //strSQL = "Select * from tblMaintenancePlanDate where MPDCode = '" + txtMPDCode.Text.Trim() + "'";
                strSQL = "Select * from tblMaintenancePlanDate where MPCode = '" + txtMPCode.Text.Trim() + "'";

                ConManager.DBConnection("TERMSMNT");
                ConManager.OpenDataTableThroughAdapter(strSQL, out DTLocal, true);
                DTLocal.TableName = "MaintenanceDates";
                DVLocal.Table = DTLocal;

                if (DVLocal.Count == 0)
                {

                    NewMPDateCode();
                    DRLocal = DTLocal.NewRow();
                    DRLocal["MPDCode"] = txtMPDCode.Text.Trim();
                    DRLocal["SheduleDate"] = Convert.ToDateTime(grdEdit.Rows[i].Cells[1].Text);

                    DRLocal["MPCode"] = Session["USER"].ToString().Trim();
                    DRLocal["Remarks"] = "";


                    DTLocal.Rows.Add(DRLocal);

                    txtMPDCode.Text = "";
                }
                else
                {
                    DRLocal = DVLocal[0].Row;
                    DRLocal.BeginEdit();

                    if (txtSheduleDate.Text != "")
                        DRLocal["SheduleDate"] = Convert.ToDateTime(txtSheduleDate.Text.Trim());
                    if (txtRemark.Text != "")
                        DRLocal["Remarks"] = txtRemark.Text.Trim();
                    if (txtMPDCode.Text != "")
                        DRLocal["MPDCode"] = txtMaintenanceSheduleCode.Text.Trim();
                    DRLocal["MPCode"] = txtMPCode.Text.Trim();

                    DRLocal.EndEdit();

                }
                ConManager.DBConnection("TERMSMNT");
                ConManager.BeginTransaction();
                ConManager.SaveDataTableThroughAdapter(ref DTLocal, true);
                ConManager.CommitTransaction();
            }




        }
        catch (Exception ex)
        {
            throw ex;
        }
        finally
        {
            ConManager.CloseConnection();
        }
    }