connectionstring property has not been initialized windows forms

Question

Hello

if been searching the web for a solution but noting worked. I make a connectionstring to my sql database. But when i wan't to store the typed data by pushing a button in wouldn't work. If you need more information ask. 

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.SqlClient;

namespace GIPBeta

{

    public partial class Form1 : Form

    {

        //Aanmaken van een string variable

        private string LK_Naam;

        public Form1()

        {

            InitializeComponent();

        }

        private void sqlDataAdapter1_RowUpdated(object sender, SqlRowUpdatedEventArgs e)

        {

            this.sqlDataAdapter1.TableMappings.AddRange(new System.Data.Common.DataTableMapping[] {

            new System.Data.Common.DataTableMapping("Table", "LeerkrachtenTB", new System.Data.Common.DataColumnMapping[] {

                        new System.Data.Common.DataColumnMapping("LK_ID", "LK_ID"),

                        new System.Data.Common.DataColumnMapping("LK_Naam", "LK_Naam")})});

        }

        private void Test()

        {

            sqlCommand1.CommandText = "INSERT INTO LeerkrachtenTB(LK_ID, LK_Naam) VALUES (@LK_ID, @LK_Naam); SELECT LK_ID" +

               ", LK_Naam FROM LeerkrachtenTB";

            sqlCommand1.Connection = sqlConnection1;

            sqlCommand1.Parameters.AddRange(new System.Data.SqlClient.SqlParameter[] {

            new System.Data.SqlClient.SqlParameter("@LK_ID", System.Data.SqlDbType.Int, 4, "LK_ID"),

            new System.Data.SqlClient.SqlParameter("@LK_Naam", System.Data.SqlDbType.NVarChar, 50, "LK_Naam")});

            // 

            // sqlConnection1

            // 

            sqlConnection1.ConnectionString = "data source=localhost;initial catalog=GIPDatabase;persist security info=False;" +

                "user id=GIPBeheerder; password=CMscout; workstation id=THOMAS-PC;packet size=8000";

            sqlConnection1.FireInfoMessageEventOnUserErrors = false;

            // 

            // sqlSelectCommand1

            // 

            sqlCommand2.CommandText = "SELECT LK_ID, LK_Naam FROM LeerkrachtenTB";

            sqlCommand2.Connection = sqlConnection1;

 

        }

        private void Form1_Load(object sender, EventArgs e)

        {

        }

        private void buttonSave_Click(object sender, EventArgs e)

        {

            if (textBoxNaam.Text == "")

                MessageBox.Show("Please enter your name");

            else

            {

                sqlConnection1.Open();

                string insert = "INSERT INTO LeerkrachtenTB(LK_Naam) VALUES ('" + LK_Naam + "')";

                SqlCommand cmd = new SqlCommand(insert, sqlConnection1);

                cmd.ExecuteNonQuery();

                sqlConnection1.Close();

                MessageBox.Show("Je ben ingeschreven.");

            }

        }

        private void textBoxNaam_TextChanged(object sender, EventArgs e)

        {

            LK_Naam = textBoxNaam.Text.ToString();

        }

    }

}

Answer 1

Are you getting an error or something? If yes, what error and which statement are you getting it at?