'gs_ConnString'이름이 현재 컨텍스트에 없습니다.

Question

using System; 
using System.Collections.Generic; 
using System.ComponentModel; 
using System.Data; 
using System.Drawing; 
using System.Linq; 
using System.Text; 
using System.Windows.Forms; 
using System.Data.OleDb; 

namespace WindowsFormsApplication1 
{ 
    public partial class Form1 : Form 
    { 
     public Form1() 
     { 
      InitializeComponent(); 
       } 

     private void ClearForm() 
     { 
      tb_EmpNr.Clear(); 
      tb_LastName.Clear(); 
      tb_FirstName.Clear(); 
      tb_MiddleName.Clear(); 
      tb_Address.Clear(); 
      tb_Zip.Clear(); 
      tb_City.Clear(); 
      tb_State.Clear(); 
      tb_Phone.Clear(); 
      tb_PayLevel.Clear(); 
      tb_PayGrade.Clear(); 
      tb_DOH.Clear(); 
     }//end clear form 

     private void GetCityState() 
     { 
      try 
      { 
       //create the connection 
       string Query = "SELECT City, State " + 
             " FROM tbl_Zip WHERE Zip=" + "\"" + tb_Zip.Text + "\"" + ""; 
       OleDbConnection Connection = new OleDbConnection(gs_ConnString); 
       OleDbCommand Command = new OleDbCommand(Query, Connection); 
       Connection.Open(); 
       OleDbDataReader Reader; 
       Reader = Command.ExecuteReader(); 
       Reader.Read(); 
       tb_City.Text = Reader.GetString(0); 
       tb_State.Text = Reader.GetString(1); 
       Reader.Close(); 
       Connection.Close(); 
      }//end try 
      catch (Exception error) 
      { 
       MessageBox.Show("Message: " + error.Message, 
        "EMPLOYEE MDB ACCESS GET ZIP ERROR", MessageBoxButtons.OK, 
        MessageBoxIcon.Error); 
      }//end catch 
     }//end get city state 

     private void GetRecFromDatabase(string s_EmpNr) 
     { 
      try 
      { 
       //create the connection 
       string Query = "SELECT EmpNumber, EmpLastName, EmpFirstName, EmpMiddleName, EmpAddress, EmpZip," + 
             " EmpPhone, EmpPayLevel, EmpPayGrade, EmpHireDate" + 
             " FROM tbl_Employee WHERE EmpNumber=" + "\"" + s_EmpNr + "\"" + ""; 
       OleDbConnection Connection = new OleDbConnection(gs_ConnString); 
       OleDbCommand Command = new OleDbCommand(Query, Connection); 
       Connection.Open(); 
       OleDbDataReader Reader; 
       Reader = Command.ExecuteReader(); 
       Reader.Read(); 
       tb_EmpNr.Text = Reader.GetString(0); 
       tb_LastName.Text = Reader.GetString(1); 
       tb_FirstName.Text = Reader.GetString(2); 
       tb_MiddleName.Text = Reader.GetString(3); 
       tb_Address.Text = Reader.GetString(4); 
       tb_Zip.Text = Reader.GetString(5); 
       tb_Phone.Text = Reader.GetString(6); 
       tb_PayGrade.Text = String.Format("{0}", Reader.GetInt32(7)); 
       tb_PayLevel.Text = String.Format("{0}", Reader.GetInt32(8)); 
       tb_DOH.Text = String.Format("{0:d}", Reader.GetDateTime(9)); 
       Reader.Close(); 
       Connection.Close(); 
       GetCityState(); 
      }//end try 
      catch (Exception error) 
      { 
       MessageBox.Show("Message: " + error.Message, 
        "EMPLOYEE MDB ACCESS GET ERROR", MessageBoxButtons.OK, 
        MessageBoxIcon.Error); 
      }//end catch 
     }//end GetRecFromDatabase 




     private void b_Clear_Screen_Click_Click(object sender, EventArgs e) 
     { 
      ClearForm(); 
      tb_EmpNr.Focus(); 
     } 

     private void b_Add_Customer_Click(object sender, EventArgs e) 
     { 
      try 
      { 
       //create the connection 
       string Query = "INSERT INTO tbl_Employee (EmpNumber, EmpLastName, EmpFirstName, EmpMiddleName, " + 
                 "EmpAddress, EmpZip, EmpPhone, EmpHireDate, EmpPayLevel, EmpPayGrade)" + 
          "VALUES(" + "\"" + tb_EmpNr.Text + "\"" + ", "  //strings get double quotes 
             + "\"" + tb_LastName.Text + "\"" + ", " 
             + "\"" + tb_FirstName.Text + "\"" + ", " 
             + "\"" + tb_MiddleName.Text + "\"" + ", " 
             + "\"" + tb_Address.Text + "\"" + ", " 
             + "\"" + tb_Zip.Text + "\"" + ", " 
             + "\"" + tb_Phone.Text + "\"" + ", " 
             + "#" + tb_DOH.Text + "#" + ", " 
             + tb_PayLevel.Text + ", " 
             + tb_PayGrade.Text 
             + ")"; 
       OleDbConnection Connection = new OleDbConnection(gs_ConnString); 
       OleDbCommand Command = new OleDbCommand(Query, Connection); 
       Connection.Open(); 
       OleDbDataReader Reader; 
       Reader = Command.ExecuteReader(); 
       Reader.Close(); 
       Connection.Close(); 
      }//end try 
      catch (Exception error) 
      { 
       MessageBox.Show("Message: " + error.Message, 
        "EMPLOYEE MDB ACCESS ADD ERROR", MessageBoxButtons.OK, 
        MessageBoxIcon.Error); 
      }//end catch 
     } 

     private void b_Get_Customer_Click(object sender, EventArgs e) 
     {//get a specific rec 
      GetRecFromDatabase(tb_EmpNr.Text); 
     } 

     private void tb_Zip_TextChanged(object sender, EventArgs e) 
     {//get the city and state 
      GetCityState(); 
     } 

     private void b_Get_Next_Customer_Click(object sender, EventArgs e) 
     {//get next rec 
      string s_NextRec = Convert.ToString(Convert.ToInt32(tb_EmpNr.Text) + 1); 
      GetRecFromDatabase(s_NextRec); 
     } 

     private void b_Update_Customer_Click(object sender, EventArgs e) 
     {//update the record 
      try 
      { 
       string Query = "UPDATE tbl_Employee SET " + 
            "EmpLastName =" + "\"" + tb_LastName.Text + "\"" + ", " + 
            "EmpFirstName =" + "\"" + tb_FirstName.Text + "\"" + ", " + 
            "EmpMiddleName =" + "\"" + tb_MiddleName.Text + "\"" + ", " + 
            "EmpAddress =" + "\"" + tb_Address.Text + "\"" + ", " + 
            "EmpZip =" + "\"" + tb_Zip.Text + "\"" + ", " + 
            "EmpPhone =" + "\"" + tb_Phone.Text + "\"" + ", " + 
            "EmpHireDate =" + "#" + tb_DOH.Text + "#" + " " + ", " + 
            "EmpPayLevel =" + Convert.ToInt32(tb_PayLevel.Text) + ", " + 
            "EmpPayGrade =" + Convert.ToInt32(tb_PayGrade.Text) + 
           " WHERE EmpNumber =" + "\"" + tb_EmpNr.Text + "\"" + " "; 

       OleDbConnection Connection = new OleDbConnection(gs_ConnString); 
       OleDbCommand Command = new OleDbCommand(Query, Connection); 
       Connection.Open(); 
       OleDbDataReader Reader; 
       Reader = Command.ExecuteReader(); 
       Reader.Close(); 
       Connection.Close(); 
       GetRecFromDatabase(tb_EmpNr.Text); 
      }//end try 
      catch (Exception error) 
      { 
       MessageBox.Show("Message: " + error.Message, 
           "EMPLOYEE MDB ACCESS ERROR", MessageBoxButtons.OK, 
           MessageBoxIcon.Error); 
      }//end catch 
     }//end update click 
    }//end class 
}//end namespace 

이 프로그램은 Microsoft Visual Studio의 디버그 폴더에 저장 한 Microsoft Access 데이터베이스에서 데이터를 가져옵니다. 그러나 질문 제목에 오류가 표시됩니다. 어떤 도움이라도 대단히 감사하겠습니다! -이 오류는 코드 전체에 걸쳐 네 번 나타납니다.

Answer 1

오류 상태로 gs_ConnString을 정의하지 마십시오. 다음과 같이 추가 할 수 있습니다.

// using statements 
// ... 
namespace WindowsFormsApplication1 
{ 
    public partial class Form1 : Form 
    { 
     private string gs_ConnString = "[put the connection string here]"; 
     public Form1() 
     { 
      InitializeComponent(); 
     } 
     // ... 
    } 
}