Thread: The ConnectionString property has not been initialized.

  1. #1
    Registered User
    Join Date
    Aug 2009

    The ConnectionString property has not been initialized.

    I'm trying to write a registration form in windows application and insert the information to a SQL Database !

    I got this error ! :

    ************** Exception Text **************
    System.InvalidOperationException: The ConnectionString property has not been initialized.
    at System.Data.Common.DbDataAdapter.UpdatingRowStatus Errors(RowUpdatingEventArgs rowUpdatedEvent, DataRow dataRow)
    at System.Data.Common.DbDataAdapter.Update(DataRow[] dataRows, DataTableMapping tableMapping)
    at System.Data.Common.DbDataAdapter.UpdateFromDataTab le(DataTable dataTable, DataTableMapping tableMapping)
    at System.Data.Common.DbDataAdapter.Update(DataSet dataSet, String srcTable)
    at FingerAppNet.Register.btnRegister_Click(Object sender, EventArgs e) in C:\******\Register.cs:line 114 ( This Line : da.Update(ds1, "Reg"); )

    Here's my code :

    using System;
    using System.Collections.Generic;
    using System.ComponentModel;
    using System.Data;
    using System.Drawing;
    using System.Text;
    using System.Windows.Forms;
    using System.Data.SqlClient;      // For the database connections and objects.
    using System.Data.Common;
    using System.Configuration;
    namespace FingerAppNet
        public partial class Register : Form
            public Register()
            System.Data.SqlClient.SqlConnection con;
            int MaxRows = 0;
            int inc = 0;
            private void Register_Load(object sender, EventArgs e)
                con = new System.Data.SqlClient.SqlConnection();
                ds1 = new DataSet();
                con.ConnectionString ="Data Source=.\\SQLEXPRESS;AttachDbFilename=|DataDirectory|\\Reg.mdf;Integrated Security=True;User Instance=True";
                string sq1 = "SELECT * FROM RegisterUser";
                da = new System.Data.SqlClient.SqlDataAdapter(sq1, con);
                da.Fill(ds1, "Reg");
    private void btnRegister_Click(object sender, EventArgs e)
                if (tbtPassword.Text != tbtConfirmPassword.Text)
                    MessageBox.Show("passwords are not Match!");
                    MessageBox.Show("The details are fine");
                    System.Data.SqlClient.SqlCommandBuilder cb;
                    cb = new System.Data.SqlClient.SqlCommandBuilder(da);
                    DataRow dRow = ds1.Tables["Reg"].NewRow();
                    dRow[1] = tbtUserName.Text;
                    dRow[2] = tbtPassword.Text;
                    dRow[3] = tbtConfirmPassword.Text;
                    dRow[4] = tbtImage.Text;
                    MaxRows = MaxRows + 1;
                    inc = MaxRows - 1;
                    da.Update(ds1, "Reg");
    Can someone tell me how to fix it ?
    Last edited by shembelcut; 08-23-2009 at 01:17 AM.

  2. #2
    Tha 1 Sick RAT
    Join Date
    Dec 2003
    con.ConnectionString =@"Data Source=.\\SQLEXPRESS;AttachDbFilename=|DataDirectory|\\Reg.mdf;Integrated Security=True;User Instance=True";
    I haven't read your whole code but this might be the problem. The @ should prevent you needing to escape everything

    has a typo here. You're missing a ".
    Last edited by WDT; 08-23-2009 at 12:13 PM.
    A hundred Elephants can knock down the walls of a fortress... One diseased rat can kill everyone inside

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