Multiple dropdowns from different databases on a single view in asp.net mvc4 - asp.net

Question

The following code i have used in web form and i want to convert it into asp.net mvc4 with four buttons and their events and grid.
using System;
using System.Collections.Generic;
using System.Linq;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace MasterFiles
{
public partial class WebForm1 : System.Web.UI.Page
{
//This is the connection string
public static String connstr = "Data Source=23.22.136.160;Initial Catalog=Medcare;Persist Security Info=True;User ID=sa;Password=dlink";
//This is common method to bind the drop downs
public static void FillDDList(ref DropDownList DropDownName, String Query)
{
using (SqlConnection con = new SqlConnection(connstr))
{
con.Open();
SqlDataReader dr;
try
{
//Check whether the Drop Down has existing items. If YES, empty it.
if (DropDownName.Items.Count > 0)
DropDownName.Items.Clear();
SqlCommand cmd = new SqlCommand(Query, con);
dr = cmd.ExecuteReader();
while (dr.Read())
{
ListItem extLI = new ListItem();
extLI.Value = dr[0].ToString();
extLI.Text = dr[1].ToString();
DropDownName.Items.Add(extLI);
}
dr.Close();
con.Close();
}
catch (Exception ex)
{
con.Close();
//RunCustomScript("alert('" + ex.Message.ToString() + "')", callingPageObjectName);
}
}
}
//This is the method to bind the grid.
public static bool FillGridBySqlString(ref System.Web.UI.WebControls.GridView GVW, string strSQL)
{
SqlConnection conn = new SqlConnection();
System.Data.SqlClient.SqlCommand SqlComm1 = new System.Data.SqlClient.SqlCommand();
DataSet ds = new DataSet();
DataTable dt_Kit = new DataTable();
//DataTable dt_Items = new DataTable();
SqlDataAdapter ListAdapter = new SqlDataAdapter();
conn.ConnectionString = connstr;
SqlCommand dataSelectCommand = new SqlCommand();
dataSelectCommand.CommandType = CommandType.Text;
dataSelectCommand.CommandText = strSQL;
dataSelectCommand.CommandType = System.Data.CommandType.Text;
dataSelectCommand.Connection = conn;
ListAdapter.SelectCommand = dataSelectCommand;
ListAdapter.Fill(dt_Kit);
dt_Kit.TableName = "Kit";
ds.Tables.Add(dt_Kit);
GVW.DataSource = ds;
GVW.DataMember = "Kit";
GVW.DataBind();
try
{
dt_Kit.Clear();
ds.Tables.Remove(dt_Kit);
ds.Clear();
}
catch
{
}
return true;
}
//This is the method to execute the sql command.
public static void execNonQuerySQL(string sql)
{
SqlConnection conn = new SqlConnection();
conn.ConnectionString = connstr;
DataSet ds = new DataSet();
SqlCommand dataSelectCommand = new SqlCommand();
try
{
dataSelectCommand.CommandType = CommandType.Text;
dataSelectCommand.CommandText = sql;
dataSelectCommand.Connection = conn;
conn.Open();
dataSelectCommand.ExecuteNonQuery();
}
catch { }
conn.Close();
dataSelectCommand.Dispose();
}
public static void execNonQuerySSP(string StoredProcName, Object[,] parmarr)
{
SqlConnection conn = new SqlConnection();
conn.ConnectionString = connstr;
DataSet ds = new DataSet();
SqlCommand dataSelectCommand = new SqlCommand();
try
{
dataSelectCommand.CommandType = CommandType.StoredProcedure;
dataSelectCommand.CommandText = StoredProcName;
dataSelectCommand.Connection = conn;
conn.Open();
for (int i = 0; i < parmarr.Length / 2; )
{
dataSelectCommand.Parameters.AddWithValue("#" + parmarr[i, 0], parmarr[i, 1]);
if (parmarr[i++, 0] == null) break;
}
dataSelectCommand.ExecuteNonQuery();
}
catch { }
conn.Close();
dataSelectCommand.Dispose();
}
string sqlstr = "select " +
" (Select '(BCO_ID:'+Convert(varchar(5),B.MCM_APP_ID) +') -'+C.BCO_CODE+':'+C.BCO_DESCRIPTION BCO_TEXT From MasterCodesMap B,Medcare.dbo.Billing_Code C Where B.MCM_APP_ACRO = 'VMGR' AND B.MCM_VM_ID = A.MCM_VM_ID AND C.BCO_ID=B.MCM_APP_ID ) [Base Data in VM/Medcare], " +
" (Select '(BCO_ID:'+Convert(varchar(5),B.MCM_APP_ID) +') -'+C.BCO_CODE+':'+C.BCO_DESCRIPTION BCO_TEXT From MasterCodesMap B,Pils.dbo.Billing_Code C Where B.MCM_APP_ACRO = 'PILS' AND B.MCM_VM_ID = A.MCM_VM_ID AND C.BCO_ID=B.MCM_APP_ID ) [Mapped Data in PILS System], " +
" (Select '(BCO_ID:'+Convert(varchar(5),B.MCM_APP_ID) +') -'+C.BCO_CODE+':'+C.BCO_DESCRIPTION BCO_TEXT From MasterCodesMap B,Alg.dbo.Billing_Code C Where B.MCM_APP_ACRO = 'ALG' AND B.MCM_VM_ID = A.MCM_VM_ID AND C.BCO_ID=B.MCM_APP_ID ) [Mapped Data in ALG System], " +
" (Select '(BCO_ID:'+Convert(varchar(5),B.MCM_APP_ID) +') -'+C.BCO_CODE+':'+C.BCO_DESCRIPTION BCO_TEXT From MasterCodesMap B,Boise1.dbo.Billing_Code C Where B.MCM_APP_ACRO = 'USI' AND B.MCM_VM_ID = A.MCM_VM_ID AND C.BCO_ID=B.MCM_APP_ID ) [Mapped Data in USI System] " +
" from MasterCodesMap A where MCM_APP_ACRO = 'VMGR' " +
" Order by 2 ";
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
FillDDList(ref DropDownList1, "SELECT -1,'No Virtual Manager Match' UNION select BCO_ID,BCO_DESCRIPTION + ' =>'+ BCO_CODE BCO_TEXT from Medcare.dbo.Billing_Code Order by 1");
FillDDList(ref DropDownList2, "SELECT -1,'No Virtual Manager Match' UNION select BCO_ID,BCO_DESCRIPTION + ' =>'+ BCO_CODE BCO_TEXT from PILS.dbo.Billing_Code Order by 1");
FillDDList(ref DropDownList3, "SELECT -1,'No Virtual Manager Match' UNION select BCO_ID,BCO_DESCRIPTION + ' =>'+ BCO_CODE BCO_TEXT from ALG.dbo.Billing_Code Order by 1");
FillDDList(ref DropDownList4, "SELECT -1,'No Virtual Manager Match' UNION select BCO_ID,BCO_DESCRIPTION + ' =>'+ BCO_CODE BCO_TEXT from Boise1.dbo.Billing_Code Order by 1");
FillGridBySqlString(ref GridView1, sqlstr);
}
}
protected void GridView1_SelectedIndexChanged(object sender, EventArgs e)
{
}
protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
// Set the hand mouse cursor for the selected row.
e.Row.Attributes.Add("OnMouseOver", "this.style.cursor = 'hand';");
//////// The seelctButton exists for ensuring the selection functionality
//////// and bind it with the appropriate event hanlder.
//////LinkButton selectButton = new LinkButton()
//////{
////// CommandName = "Select",
////// Text = e.Row.Cells[0].Text
//////};
//////selectButton.Font.Underline = false;
//////selectButton.ForeColor = System.Drawing.Color.Beige;
//////e.Row.Cells[3].Controls.Add(selectButton);
////////e.Row.Attributes["OnClick"] =
//////// Page.ClientScript.GetPostBackClientHyperlink(selectButton, "");
//////e.Row.Attributes["onclick"] = ClientScript.GetPostBackClientHyperlink(this.GridView1, "Select$" + e.Row.RowIndex);
}
}
protected void Button1_Click(object sender, EventArgs e)
{
if(DropDownList1.SelectedIndex != 0)
{
Object[,] parmarr = {
{ "TABLE_ACRO", "BLCD"},
{ "Orig_MCM_ID", -1 },
{ "App_ACRO", "VMGR" },
{ "VMID", DropDownList1.SelectedValue},
{ "APP_ID", DropDownList1.SelectedValue},
};
execNonQuerySSP("crtMasterCodesMap",parmarr);
}
if (DropDownList2.SelectedIndex != 0)
{
Object[,] parmarr = {
{ "TABLE_ACRO", "BLCD"},
{ "Orig_MCM_ID", -1 },
{ "App_ACRO", "PILS" },
{ "VMID", DropDownList1.SelectedValue},
{ "APP_ID", DropDownList2.SelectedValue},
};
execNonQuerySSP("crtMasterCodesMap", parmarr);
}
if (DropDownList3.SelectedIndex != 0)
{
Object[,] parmarr = {
{ "TABLE_ACRO", "BLCD"},
{ "Orig_MCM_ID", -1 },
{ "App_ACRO", "ALG" },
{ "VMID", DropDownList1.SelectedValue},
{ "APP_ID", DropDownList3.SelectedValue},
};
execNonQuerySSP("crtMasterCodesMap", parmarr);
}
if (DropDownList4.SelectedIndex != 0)
{
Object[,] parmarr = {
{ "TABLE_ACRO", "BLCD"},
{ "Orig_MCM_ID", -1 },
{ "App_ACRO", "USI" },
{ "VMID", DropDownList1.SelectedValue},
{ "APP_ID", DropDownList4.SelectedValue},
};
execNonQuerySSP("crtMasterCodesMap", parmarr);
}
FillGridBySqlString(ref GridView1, sqlstr);
}
protected void Button2_Click(object sender, EventArgs e)
{
execNonQuerySQL("delete MasterCodesMap where MCM_VM_ID = " + DropDownList1.SelectedValue);
FillGridBySqlString(ref GridView1, sqlstr);
}
protected void Button3_Click(object sender, EventArgs e)
{
Object[,] parmarr = {
{ "iVM_ID", DropDownList1.SelectedValue},
{ "iTABLE_ACRO", "BLCD"}
};
execNonQuerySSP("synchVMMasterData", parmarr);
FillGridBySqlString(ref GridView1, sqlstr);
}
protected void Button4_Click(object sender, EventArgs e)
{
FillGridBySqlString(ref GridView1, sqlstr);
}
}
}

Answer 1

you can pass your data for dropdownlist by ViewBag:
ViewBag.ProfileId = new SelectList(db.UserProfiles, "Id", "Username");
and get in your view :
#Html.DropDownList("ProfileId", String.Empty)
or another example :
Controller
public ActionResult Index()
{
List<SelectListItem> obj1 = new List<SelectListItem>();
obj1.Add(new SelectListItem { Text = "Text1", Value = "1" });
obj1.Add(new SelectListItem { Text = "Text2", Value = "2" });
obj1.Add(new SelectListItem { Text = "Text3", Value = "3" });
List<SelectListItem> obj2 = new List<SelectListItem>();
obj2.Add(new SelectListItem { Text = "Text1", Value = "1" });
obj2.Add(new SelectListItem { Text = "Text2", Value = "2" });
obj2.Add(new SelectListItem { Text = "Text3", Value = "3" });
ViewBag.State1 = obj1;
ViewBag.State2 = obj2;
return View();
}
View
#Html.DropDownList(“State1”)
#Html.DropDownList(“State2”)
but in my opinion better way is using ViewModel for this issue .