i have 3 dropdownlist in gridview

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C#

ASP.NET

I have 3 dropdownlist in gridview. Dropdownlist selected indexchanged event,i have bank name,branch,account,corresponding branch

$acoount_depending

on the bank name i've already used dropdownlist on selecteditem. Text to get text and value to assign as value. i've also assigned value to another column but while I'm adding new row previously set selectedvalue is cleared. plse reply me..thanks

This my code:

  protected void btnAddBnkDtls_Click(object sender, EventArgs e)//rosna
        {            
            DataTable dt = blSupplierObj.BindBnkDtlsGrid(ref GrdvewBnkDetls);
            DataRow dr = dt.NewRow();
            
            dt.Rows.Add(dr);
            ViewState["dtBnk"] = dt;
            rowid = 0;
            GrdvewBnkDetls.DataSource = dt;
            GrdvewBnkDetls.DataBind();           
        }

        protected void GrdvewBnkDetls_RowDataBound(object sender, GridViewRowEventArgs e)
        {            Trace.Write("ADMIN.Master.frmPartySupplier_Customer.GrdvewBnkDetls_RowDataBound");

            if (e.Row.RowType == DataControlRowType.DataRow)
            {
                if (e.Row.RowIndex != -1)
                {

                        e.Row.Cells[0].Text = Convert.ToString((e.Row.RowIndex + 1));
                        DropDownList ddlBank = (DropDownList)e.Row.FindControl("ddlBnkNme");
                        ddlBank.DataSource = dtBankDetails;
                        ddlBank.DataTextField = "Name";
                        ddlBank.DataValueField = "Uoid";
                        ddlBank.DataBind();
                        DataTable dt = (DataTable)ViewState["dtBnk"];
                        if (dt != null)
                        {
                            if (rowid < dt.Rows.Count)
                            {
                                ddlBank.SelectedValue = dt.Rows[rowid]["BankName"].ToString();
                            }
                            if (ddlBank.SelectedValue != "0")
                            {
                                DropDownList ddlBranch = (DropDownList)e.Row.FindControl("ddlBrnch");
                                blSupplierObj.BindCombo(ref ddlBranch, "Uoid", "Name", "SELECT Uoid,Name fROM CFN_TB_BankBranch Where FK_BankID ='" + ddlBank.SelectedValue + "' ");
                                if (dt.Rows[rowid]["Branch"].ToString() != "0")
                                    ddlBranch.SelectedValue = dt.Rows[rowid]["Branch"].ToString();
                            }
                            DropDownList ddlAcount = (DropDownList)e.Row.FindControl("ddlAccnt");
                            ddlAcount.DataSource = dtAccount;
                            ddlAcount.DataTextField = "Name";
                            ddlAcount.DataValueField = "Uoid";
                            ddlAcount.DataBind();
           
                            string str = DataBinder.Eval(e.Row.DataItem, "Account").ToString().Trim();
                            if (str != "")
                            {
                                ddlAccount.SelectedValue = str;
                            }
                        }
                        else
                        {
                            DropDownList ddlAcount = (DropDownList)e.Row.FindControl("ddlAccnt");
                            ddlAcount.DataSource = dtAccount;
                            ddlAcount.DataTextField = "Name";
                            ddlAcount.DataValueField = "Uoid";
                            ddlAcount.DataBind();
                        }
                }
            }
        }

        protected void GrdvewBnkDetls_RowCommand(object sender, GridViewCommandEventArgs e)//rosna
        {
            Trace.Write("ADMIN.Master.frmPartySupplier_Customer.GrdvewBnkDetls_RowCommand");
            GridViewRow objGridViewRow = (GridViewRow)((ImageButton)e.CommandSource).Parent.Parent;

            if (e.CommandName == "onDelete")
            {
                DataTable dt = blSupplierObj.BindBnkDtlsGrid(ref GrdvewBnkDetls);
                if (dt.Rows.Count > 0)
                {
                    int id = int.Parse(objGridViewRow.Cells[0].Text);
                    BL_PartySupplier_Customer.Tablefilter(ref dt, "  RowID <> " + id.ToString());
                    rowid = 0;
                    GrdvewBnkDetls.DataSource = dt;
                    GrdvewBnkDetls.DataBind();
                    ViewState["dtBnk"] = dt;                    
                }
                else
                {
                }
            }
        }
public string GetBankDtils(ref GridView GrdvewBnkDetls, string buttonText, ENT_PartySupplier_Customer entbnkObj)
       {
           //...
           StringBuilder strQuery = new StringBuilder();
           string strQuerys = string.Empty;
           if (GrdvewBnkDetls.Rows.Count >= 1 &&
              (GrdvewBnkDetls.Rows[0].FindControl("ddlBnkNme") as DropDownList).SelectedValue != "0")
           {
               for (int i = 0; i < GrdvewBnkDetls.Rows.Count; i++)
               {
                   //--
                   strQuery.Append(" SELECT ");
                     strQuery.Append("'" + Guid.NewGuid() + "',");
                       strQuery.Append("'" + (GrdvewBnkDetls.Rows[i].Cells[1].FindControl("ddlBnkNme") as DropDownList).SelectedValue + "',");
                       strQuery.Append("'" + (GrdvewBnkDetls.Rows[i].Cells[2].FindControl("ddlBrnch") as DropDownList).SelectedValue + "',");
                       strQuery.Append("'" + entbnkObj.PartyUoid + "',");
                       strQuery.Append("'" + (GrdvewBnkDetls.Rows[i].Cells[3].FindControl("ddlAccnt") as DropDownList).SelectedValue + "',");
                       strQuery.Append("'" + Guid.NewGuid() + "',");
                       strQuery.Append("'" + clsCommon.convertDate(DateTime.Now.ToString("dd/MM/yyyy")) + "',");
                       strQuery.Append("0");
                       strQuery.Append(" UNION ALL ");

               }
               strQuerys = strQuery.ToString();
           }

           else
           {
               strQuerys = string.Empty;
           }

           if (strQuerys != string.Empty)
           {
               int x = strQuery.ToString().Length;
               strQuerys = strQuerys.Remove(strQuery.ToString().Length - 11, 11);

           }

           return strQuerys;
       }