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Importing data from excelsheet file into the mysql database C#

I have the following lines of code:
protected void btnUpload_Click(object sender, EventArgs e)
{
MySqlTransaction transaction;
string ex_id = "";
string file_name = Path.GetFileName(FileUpload1.FileName);
string Excel_path = Server.MapPath("~/Excel/" + file_name);
DataTable dtExceldata = new DataTable();//just added
FileUpload1.SaveAs(Excel_path);
OleDbConnection my_con = new OleDbConnection(#"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + Excel_path + ";Extended Properties=Excel 8.0;Persist Security Info=False");
my_con.Open();
OleDbDataAdapter da = new OleDbDataAdapter("select * from [Sheet1$]", my_con);
da.Fill(dtExceldata);
if (dtExceldata.Rows.Count > 0)
{
//foreach (DataRow row in dtExceldata.Rows)
for (int i = 0; i <= dtExceldata.Rows.Count - 1; i++)
{
string ex_dir = dtExceldata.Rows[i]["website_a"].ToString();
//string ex_dir = row["website_a"].ToString();
string ex_email = dtExceldata.Rows[i]["email_id"].ToString();
// string ex_email = row["email_id"].ToString();
string ex_email1 = dtExceldata.Rows[i]["email_id2"].ToString();
//string ex_email1 = row["email_id2"].ToString();
string ex_email2 = dtExceldata.Rows[i]["email_id3"].ToString();
//string ex_email2 = row["email_id3"].ToString();
string ex_company = dtExceldata.Rows[i]["company"].ToString();
//string ex_company = row["company"].ToString();
string ex_contact = dtExceldata.Rows[i]["contact_name"].ToString();
//string ex_contact = row["contact_name"].ToString();
string ex_proposal = dtExceldata.Rows[i]["proposal_status"].ToString();
// string ex_proposal = row["proposal_status"].ToString();
string ex_reason = dtExceldata.Rows[i]["reason"].ToString();
//string ex_reason = row["reason"].ToString();
int chk = 0;
int type = 0;
int dup = 0;
int dir = 0;
if (ddlwebsites.SelectedIndex != 0)
{
dir = Convert.ToInt32(ddlwebsites.SelectedValue);
if (dir == 8)
{
type = 1;
}
}
foreach (ListItem lstAssign in ddlevents.Items)
{
if (lstAssign.Selected == true)
{
chk = 1;
}
}
if (type == 1 && chk == 0)
{
evyerror.Text = "Please Select the Event!!";
return;
}
else
{
string querycomp = "", compID = "";
querycomp = "Select * from barter_company where website like '%' '" + ex_dir + "' '%'";
string connStr = ConfigurationManager.ConnectionStrings["BarterConnectionString"].ToString();
connect = new MySqlConnection(connStr);
connect.Open();
transaction = connect.BeginTransaction();
try
{
ClassDtBaseConnect clsDtResult = new ClassDtBaseConnect();
DataTable dt = clsDtResult.GetDataTable(querycomp);
if (dt.Rows.Count > 0)
{
compID = dt.Rows[0]["comp_id"].ToString();
ViewState["comp_id"] = compID;
if (type == 1)
{
dup = checkforDuplicates(Convert.ToInt32(compID));
if (dup == 1)
{
//Confirm_MP.Show();
// ScriptManager.RegisterStartupScript(this, this.GetType(), "script", "confirmation();", true);
}
}
//return;
}
else
{
string queryStr = "insert into barter_company (comp_name,website) values(?comp,?website)";
MySqlCommand cmd = new MySqlCommand(queryStr, connect, transaction);
cmd.Parameters.AddWithValue("?comp", ex_company);
cmd.Parameters.AddWithValue("?website", ex_dir);
cmd.ExecuteNonQuery();
cmd.CommandText = "Select LAST_INSERT_ID()";
compID = cmd.ExecuteScalar().ToString();
transaction.Commit();
connect.Close();
}
}
catch
{
transaction.Rollback();
}
if (dup == 0)
{
// create a connection string with your sql database
string connStr1 = ConfigurationManager.ConnectionStrings["BarterConnectionString"].ToString();
connect = new MySqlConnection(connStr1);
connect.Open();
DateTime date = new DateTime();
date = DateTime.ParseExact(txtsentdate.Text, "MM/dd/yyyy", null);
string SentDateString = date.ToString("yyyy/MM/dd");
//DateTime date = new DateTime();
//if (!string.IsNullOrEmpty(ex_date))
// {
//DateTime date = new DateTime();//added by chetan
//ex_date = ex_date.Split(' ')[0];//added by chetan
//date = DateTime.ParseExact(ex_date, "MM/dd/yyyy", null);//added by chetan
//string SentDateString = date.ToString("yyyy/MM/dd");//added by chetan
//DateTime SentDate = Convert.ToDateTime(SentDateString).Date;//added by chetan
//// DateTime date = DateTime.Parse(ex_date);//added by chetan
// }
//date = DateTime.ParseExact(ex_date, "MM/dd/yyyy", System.Globalization.CultureInfo.InvariantCulture);//added by chetan
//date = DateTime.ParseExact(ex_date, "MM/dd/yyyy", null);
// string SentDateString = date.ToString("yyyy/MM/dd");
transaction = connect.BeginTransaction();
try
{
string ex_uid = Session["session_barterUser_id"].ToString();
MySqlCommand cmd = new MySqlCommand("insert into barter_proposals(user_id, sent_date, website_a, email_id, email_id2, email_id3, company, contact_name, proposal_status, reason,type) values(?uid,?sentdate,?dir,?email,?email2,?email3,?comp,?cont_name,?pro_status,?reason,?type)", connect);
cmd.Parameters.AddWithValue("?uid", ex_uid);
cmd.Parameters.AddWithValue("?comp", compID);
cmd.Parameters.AddWithValue("?sentdate", SentDateString);
// command.Parameters.AddWithValue("?event", eventname);
cmd.Parameters.AddWithValue("?dir", dir);
// command.Parameters.AddWithValue("?bar_type", ddlbartertype.SelectedValue);
// command.Parameters.AddWithValue("?website_b", txtwebsite.Text);
//cmd.Parameters.AddWithValue("?comp", ex_company);
cmd.Parameters.AddWithValue("?cont_name", ex_contact);
cmd.Parameters.AddWithValue("?email", ex_email);
cmd.Parameters.AddWithValue("?email2", ex_email1);
cmd.Parameters.AddWithValue("?email3", ex_email2);
cmd.Parameters.AddWithValue("?pro_status", ex_proposal);
cmd.Parameters.AddWithValue("?reason", ex_reason);
cmd.Parameters.AddWithValue("?type", type);
// command.Parameters.AddWithValue("?type", type);
cmd.ExecuteNonQuery();
if (type == 1)
{
cmd.CommandText = "Select LAST_INSERT_ID()";
Int64 CurrentProId = Convert.ToInt64(cmd.ExecuteScalar());
int eventAssignID;
string QueryInqEventAssign = "insert into barter_propeventassign(prop_id,event_id) values(?pro_id,?event_id)";
foreach (ListItem lstAssign in ddlevents.Items)
{
if (lstAssign.Selected == true)
{
cmd = new MySqlCommand(QueryInqEventAssign, connect, transaction);
cmd.Parameters.AddWithValue("?pro_id", CurrentProId);
eventAssignID = Convert.ToInt32(lstAssign.Value);
cmd.Parameters.AddWithValue("?event_id", eventAssignID);
cmd.ExecuteNonQuery();
}
}
}//end of if
transaction.Commit();
connect.Close();
Response.Write("<script type=\"text/javascript\">alert('Proposal Added Successfully!!!');</script>");
}//end of try
catch (Exception ex)
{
transaction.Rollback();
Response.Write("<script>alert('There is an Error Ocurred:" + Server.HtmlEncode(ex.Message) + "')</script>");
}
finally
{
connect.Close();
}
}//ifdupzero
}//else
}//for//foreach
}//while //if
// dr.Close();//commented by chetan
my_con.Close();
if (System.IO.File.Exists(Excel_path))
{
System.IO.File.Delete(Excel_path);
}
}
suppose there are 2 entries in the excelsheet file.When trying to import,it is inserting those 2 rows entries into the database table.but the problem is that, the reader does not stop its execution.After reading 2 rows entry,it is reading 3rd row which is blank.i have used dr.close and it keeps on reading the rows entries which is blank.

Instead of checking if there are rows left (dr.Read()) as your loop condition, you could check if the first cell of the row is blank (dr[0].ToString() != String.Empty)
string file_name = Path.GetFileName(FileUpload1.FileName);
string Excel_path = Server.MapPath("~/Excel/" + file_name);
FileUpload1.SaveAs(Excel_path);
OleDbConnection my_con = new OleDbConnection(#"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + Excel_path + ";Extended Properties=Excel 8.0;Persist Security Info=False");
my_con.Open();
OleDbCommand command = new OleDbCommand("select * from [Sheet1$]", my_con);
OleDbDataReader dr = command.ExecuteReader();
dr.Read();
while (dr[0].ToString() != String.Empty)
{
ex_id = dr[0].ToString();
string ex_uid = dr[1].ToString();
//get second row data and assign it ex_name variable
string ex_date = dr[2].ToString();
//get thirdt row data and assign it ex_name variable
string ex_dir = dr[3].ToString();
//get first row data and assign it ex_location variable
string ex_email = dr[4].ToString();
string ex_email1 = dr[5].ToString();
string ex_email2 = dr[6].ToString();
//string ex_company = dr[7].ToString();
string ex_company = dr[7].ToString();
string ex_contact = dr[8].ToString();
string ex_proposal = dr[9].ToString();
string ex_reason = dr[10].ToString();
...............
//Insert operation
...............
dr.Read();
}
dr.close();
my_con.close();
The premise of course is, that the first column is always filled if the rest of the row isn't blank.
If that isn't the case you can also check other columns in the loop condition.

there is various way of doing that
you can load excel data to datatable and then you can for loop for each row with perticular column name like this
string file_name = Path.GetFileName(FileUpload1.FileName);
string Excel_path = Server.MapPath("~/Excel/" + file_name);
DataTable dtExceldata = new DataTable();
FileUpload1.SaveAs(Excel_path);
OleDbConnection my_con = new OleDbConnection(#"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + Excel_path + ";Extended
Properties=Excel 8.0;Persist Security Info=False");
OleDbDataAdapter da = new OleDbDataAdapter("select * from [Sheet1$]", my_con);
da.Fill(dtExceldata);
if(dtExceldata.Rows.Count>0)
{
for (int i = 0; i <= dtExceldata.Rows.Count - 1; i++)
{
//assign value to variable
//like below
//string ex_uid = dtExceldata.Rows[i]["columnName"];
//then insert operation here
}
}

see this excel file
and the datatable in c#
this loop will repeat for only number of row in datatable then also i practically tried this and it only loop for number of row (e.g two times) but i found a bug that if you will enter two row then five blank row then some data it will give you blank value in data table check your excel file there may some blank value as shown in attechment
then also you can skip blank value by checking null value in row like this
for (int i = 0; i <= dtExceldata.Rows.Count - 1; i++)
{
if (!String.IsNullOrEmpty(Convert.ToString(dtExceldata.Rows[i]["fieldvalues"])))
{
//assign value to variable
//like below
//string ex_uid = dtExceldata.Rows[i]["columnName"];
//then insert operation here
}
}

Updating data in listbox from datatable

I want to show data from data table on form_load using list box, and later update that data from list box on button click by Insert command. Function for that is fill_List(). This is my code:
OleDbConnection konekcija;
OleDbDataAdapter adapter = new OleDbDataAdapter();
DataTable dt = new DataTable();
public Form2()
{
InitializeComponent();
string putanja = Environment.CurrentDirectory;
string[] putanjaBaze = putanja.Split(new string[] { "bin" }, StringSplitOptions.None);
AppDomain.CurrentDomain.SetData("DataDirectory", putanjaBaze[0]);
konekcija = new OleDbConnection(#"Provider=Microsoft.ACE.OLEDB.12.0; Data Source=|DataDirectory|\B31Autoplac.accdb");
}
void fill_List()
{
konekcija.Open();
OleDbCommand komPrikaz = new OleDbCommand("SELECT * FROM GORIVO ORDER BY GorivoID ASC", konekcija);
adapter.SelectCommand = komPrikaz;
adapter.Fill(dt);
listBox1.Items.Clear();
for (int i = 0; i < dt.Rows.Count; i++)
{
string pom;
pom = dt.Rows[i][0].ToString() + " " + dt.Rows[i][1].ToString() + " " + dt.Rows[i][2];
listBox1.Items.Add(pom);
}
konekcija.Close();
}
private void Form2_Load(object sender, EventArgs e)
{
fill_List();
}
private void btnUpisi_Click(object sender, EventArgs e)
{
string s1, s2, s3;
s1 = tbSifra.Text;
s2 = tbNaziv.Text;
s3 = tbOpis.Text;
string Upisi = "INSERT INTO GORIVO (GorivoID, Naziv, Opis) VALUES (#GorivoID, #Naziv, #Opis)";
OleDbCommand komUpisi = new OleDbCommand(Upisi, konekcija);
komUpisi.Parameters.AddWithValue("#GorivoID", s1);
komUpisi.Parameters.AddWithValue("#Naziv", s2);
komUpisi.Parameters.AddWithValue("#Opis", s3);
string Provera = "SELECT COUNT (*) FROM GORIVO WHERE GorivoID=#GorivoID";
OleDbCommand komProvera = new OleDbCommand(Provera, konekcija);
komProvera.Parameters.AddWithValue("#GorivoID", s1);
try
{
konekcija.Open();
int br = (int)komProvera.ExecuteScalar();
if(br==0)
{
komUpisi.ExecuteNonQuery();
MessageBox.Show("Podaci su uspesno upisani u tabelu i bazu.", "Obavestenje");
tbSifra.Text = tbNaziv.Text = tbOpis.Text = "";
}
else
{
MessageBox.Show("U bazi postoji podatak sa ID = " + tbSifra.Text + ".", "Obavestenje");
}
}
catch (Exception ex1)
{
MessageBox.Show("Greska prilikom upisa podataka. " + ex1.ToString(), "Obavestenje");
}
finally
{
konekcija.Close();
fill_List();
}
}
Instead of this
It shows me this (added duplicates with new data)
Is there a problem in my function or somewhere else?

Another bug caused by global variables.
You are keeping a global variable for the DataTable filled by the fill_list method. This datatable is never reset to empty when you call fill_list, so at every call you add another set of rows to the datatable and then transfer this data inside the listbox. Use a local variable.
But the same rule should be applied also to the OleDbConnection and OleDbCommand. There is no need to keep global instances of them. Creating an object is really fast and the convenience to avoid global variables is better than the little nuisance to create an instance of the connection or the command.
void fill_List()
{
using(OleDbConnection konekcija = new OleDbConnection(......))
using(OleDbCommand komPrikaz = new OleDbCommand("SELECT * FROM GORIVO ORDER BY GorivoID ASC", konekcija))
{
DataTable dt = new DataTable();
konekcija.Open();
OleDbDataAdapter adapter = new OleDbDataAdapter(komPrikaz);
adapter.Fill(dt);
listBox1.Items.Clear();
for (int i = 0; i < dt.Rows.Count; i++)
{
string pom;
pom = dt.Rows[i][0].ToString() + " " + dt.Rows[i][1].ToString() + " " + dt.Rows[i][2];
listBox1.Items.Add(pom);
}
}
}

Clear your DataTable before filling it again.
void fill_List()
{
konekcija.Open();
OleDbCommand komPrikaz = new OleDbCommand("SELECT * FROM GORIVO ORDER BY GorivoID ASC", konekcija);
adapter.SelectCommand = komPrikaz;
dt.Clear(); // clear here
adapter.Fill(dt);
listBox1.Items.Clear();
for (int i = 0; i < dt.Rows.Count; i++)
{
string pom;
pom = dt.Rows[i][0].ToString() + " " + dt.Rows[i][1].ToString() + " " + dt.Rows[i][2];
listBox1.Items.Add(pom);
}
konekcija.Close();
}

how to write a single sql query based on combobox selection?

I have a winform in which user input values through a combobox. I am assigning combobox value to search db. If there is no selection then the SQL server query should not use that column to filter.
example -
if (string.IsNullOrEmpty(combobox1.text)) {
.....Select * from country
}
else if (combobox1.selectedindex > -1) {
....Select * from country where city_name = combobox.text
}
Is there a way to write a single query instead of using this multiple 'IF' conditions in case where user selects or doesn't select a value from combobox.

It is important to parameterize as well:
private const string _select = "select * from country";
void DoSomething()
{
string sql = string.Empty;
if (combobox1.SelectedIndex > -1)
{
command.Parameters.AddWithValue("#1", (string)combobox1.SelectedValue);
sql = " where city_name = #1";
}
sql = _select + sql;
command.CommandText = sql;
command.Execute...
}
#un-lucky asked me how would I deal with many conditions - here is one way
var conditions = new List<string>();
if (/* condition 1*/)
{
command.Parameters.AddWithValue("#2", (string)cboN.SelectedItem);
conditions.Add("col1 = #2");
}
if (/* condition 2*/)
{
command.Parameters.AddWithValue("#3", textBoxN.Text);
conditions.Add("col2 = #3");
}
if (conditions.Count > 0)
sql = _select + " where " + string.Join(" AND ", conditions.ToArray());

You can use the shorthand if only if you have two conditions:
string query = string.Format("Select * from country{0}", string.IsNullOrEmpty(combobox1.text) ? "" : " where city_name = " + combobox1.text);
Hope it helps!

I think you have to try something like this with parameterization:
StringBuilder queryBuilder = new StringBuilder("Select * from country Where 1=1 ");
SqlCommand cmdSql = new SqlCommand();
if (combobox1.selectedindex > -1)
{
queryBuilder.Append(" And city_name = #city_name ");
cmdSql.Parameters.Add("#city_name", SqlDbType.VarChar).Value = combobox.text;
}
else if(Condition 2)
{
queryBuilder.Append(" And column2 = #col2 ");
cmdSql.Parameters.Add("#col2", SqlDbType.VarChar).Value = "some Value here;
}
// Build the query like this
cmdSql.CommandText= = queryBuilder.ToString();
cmdSql.Connection = conObject;
// Here you can execute the command

I have a sample, try it
string select = this.combobox1.GetItemText(this.combobox1.SelectedItem); cm1 = new SqlCommand("Select * from country where city_name=#select or #select is null", con);
cm1.Parameters.Add("#select", SqlDbType.NVarChar, 50);
cm1.Parameters["#select"].Value = select;
dap = new SqlDataAdapter(cm1);
ds = new System.Data.DataSet();
dap.Fill(ds, "DATABASE");
//DataGridView1.DataSource = ds.Tables[0]; get data

Get the Row values from a excel based on the column Value

I am trying to a get the Row values from a excel sheet, based on the column Value.
e.g. I have CutsomerID as lets say 5 , so I want First name 5, last Name 5 and Address 5
I am converting whole excel sheet into DataTable and then trying to read on each DataRow, when I get CustomerID as 5, I copy all the values and break from the loop
Here is my code and it is working fine as well, but I was wondering is there any way to optimise it.
Here is my Code.
public ExcelData GetDataByCustomerID(String excelFilePath, String customerID)
{
OleDbConnectionStringBuilder connectionStringBuilder = new OleDbConnectionStringBuilder();
connectionStringBuilder.Provider = "Microsoft.ACE.OLEDB.12.0";
connectionStringBuilder.DataSource = excelFilePath;
connectionStringBuilder.Add("Mode", "Read");
const string extendedProperties = "Excel 12.0;IMEX=1;HDR=YES";
connectionStringBuilder.Add("Extended Properties", extendedProperties);
String connectionString = connectionStringBuilder.ToString();
// Create connection object by using the preceding connection string.
using( var objConn = new OleDbConnection(connectionString))
{
objConn.Open();
// Get the data table contaning the schema guid.
DataTable excelSheetsDataTable = objConn.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, null);
if (excelSheetsDataTable == null)
return null;
// get all the tables in the Sheet
List<String> excelSheets = (from DataRow row in excelSheetsDataTable.Rows select row["TABLE_NAME"].ToString()).ToList();
// Our data is on First sheet only
OleDbCommand _oleCmdSelect = new OleDbCommand(#"SELECT * FROM [" + excelSheets[0] + "]", objConn);
OleDbDataAdapter oleAdapter = new OleDbDataAdapter();
oleAdapter.SelectCommand = _oleCmdSelect;
DataTable newDataTable = new DataTable();
oleAdapter.FillSchema(newDataTable, SchemaType.Source);
oleAdapter.Fill(newDataTable);
if (newDataTable.Columns.Contains("CustomerID"))
{
foreach (DataRow rowValue in newTB.Rows)
{
if ((string) rowValue["CustomerID"] == customerID)
{
var data = new ExcelData
{
customerFirstName = rowValue["Customer_First_ Name"].ToString(),
customerLastName = rowValue["Customer_Last_Name"].ToString(),
customerAddress = rowValue["Customer_Address"].ToString(),
};
return data;
}
}
String message = String.Format("The CustomerID {0} not found in Excel file {1}", customerID, excelFilePath);
MessageBox.Show(message);
}
else
{
String message = String.Format("The Column CustomerID not found in Excel file {0}", excelFilePath);
MessageBox.Show(message);
}
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
return null;
}
public class ExcelData
{
public String customerID;
public String customerFirstName;
public String customerLastName;
public String customerAddress;
}

Change your select query to like below -
#"SELECT * FROM [" + excelSheets[0] + "] WHERE CustomerID=<your_value>"

Courtesy msdn web site:
Link: MSDN
DataTable dt;
private void button1_Click(object sender, EventArgs e)
{
try
{
openFileDialog1.ShowDialog();
string connectionString = string.Format("Provider = Microsoft.Jet.OLEDB.4.0;Data Source ={0};Extended Properties = Excel 8.0;", this.openFileDialog1.FileName);
var con = new OleDbConnection(connectionString);
var cmd = new OleDbCommand("select * from [sheet1$] where [MRN#]=#c", con);
cmd.Parameters.Add("#c", "33264");
con.Open();
var dr = cmd.ExecuteReader();
if (dr.HasRows)
{
dt = new DataTable();
dt.Load(dr);
}
dr.Close();
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
finally
{
DataGridView dv = new DataGridView();
this.Controls.Add(dv);
dv.DataSource = dt;
}
}
EDIT:
As per your code you should try the below lines of code:
OleDbCommand _oleCmdSelect = new OleDbCommand(#"SELECT * FROM [" + excelSheets[0] + "]" + " Where [CustomerID#] = #custID" , objConn);
_oleCmdSelect.Parameters.Add("#custID", customerID);
OleDbDataAdapter oleAdapter = new OleDbDataAdapter();
oleAdapter.SelectCommand = _oleCmdSelect;

ColdFusion query to C# Winform

I was given a query, originally done in ColdFusion, but I am having difficulties with the translation to a Winform use. I have a textbox that contains a concatenated string of other textboxes to make a case number. The purpose of this is to check for a record that might have been a transfer. In the first query, it is based on column caa443400048 either having something or being NULL. How would I incorporate that into a conditional statement for checking?
<cfquery name="q_transfer" datasource=#DSN#>
SELECT caa443400048
FROM caa44340
WHERE caa44340041 = '#SearchCaseNo#'
</cfquery>
<CFSET TransferCaseNo = "">
<CFSET TransferFlag = 'N'>
<CFIF #q_transfer.caa443400048# NEQ "">
<cfquery name="q_newcaseno" datasource=#DSN# >
SELECT caa44340041
FROM caa44340
WHERE caa443400018 = '#q_transfer.caa443400048#'
</cfquery>
<CFSET TransferFlag = 'Y'>
<CFSET TransferCaseNo = #SearchCaseNo#>
<CFSET SearchCaseNo = #q_newcaseno.caa44340041#>
</cfif>
Here is the C# code I am currently using:
string sql = "select COUNT (caa443400048) FROM caa44340 WHERE caa44340041 = ? ";
OdbcConnection con = new OdbcConnection("Dsn=XXXXX; User ID=XXXXX; Password=XXXXX");
con.Open();
OdbcCommand cmd = new OdbcCommand(sql, con);
cmd.Parameters.AddWithValue("caa44340041", txtCustomCaseNumber.Text);
int count = Convert.ToInt32(cmd.ExecuteScalar());
con.Close();
if (count != 0)
{
MessageBox.Show("This is a transfer");
}
else
{
MessageBox.Show("This is not a transfer");
}

I'm not 100%, but maybe this may help:
var TransferFlag = "N";
var SearchCaseNo = "";
var q_transfer = "";
var q_newcaseno = "";
using (var con = new OdbcConnection("Dsn=XXXXX; User ID=XXXXX; Password=XXXXX"))
{
con.Open();
using (var cmd = new OdbcCommand("SELECT caa443400048 FROM caa44340 WHERE caa44340041 = ?", con))
{
cmd.Parameters.AddWithValue("#var", txtCustomCaseNumber.Text);
q_transfer = (string)cmd.ExecuteScalar();
}
if (!string.IsNullOrEmpty(q_transfer))
{
using (var cmd = new OdbcCommand("SELECT caa44340041 FROM caa44340 WHERE caa443400018 = ?", con))
{
cmd.Parameters.AddWithValue("#var", q_transfer);
q_newcaseno = (string)cmd.ExecuteScalar();
}
TransferFlag = "Y";
SearchCaseNo = q_newcaseno;
MessageBox.Show("This is a transfer");
}
else
MessageBox.Show("This is not a transfer");
}