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POConnection string property has not be initialized
primarykey
Id
7878595
data
AcceptedAnswerId
7878985
AnswerCount
3
ClosedDate
CommentCount
16
CommunityOwnedDate
CreationDate
2011-10-24T16:11:17.857
FavoriteCount
0
LastActivityDate
2011-10-24T17:46:05.690
LastEditDate
2011-10-24T16:45:35.797
LastEditorUserId
719186
OwnerUserId
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PostTypeId
1
Score
0
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1921
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text
Body
When I add a Car in my application I get <blockquote> The ConnectionString property has not been initialized. </blockquote> I have the problem of ConnectionString property. I check similar question of mine but I found nothing helpfulness. I use a class connection named dbConnection.cs: <pre><code>class dbConnection { //Connection to database private string con = "Data Source=(local)\\SQLEXPRESS; Initial Catalog=MLQ7024; Integrated Security=TRUE".ToString(); public string Con { get { return con; } } } </code></pre> This is the code of my button <pre><code>private void btnAddCar_Click(object sender, EventArgs e) { using (SqlConnection con = new SqlConnection(dc.Con)) { DataTable dtCar = new DataTable(); BindingSource Car_bs = new BindingSource(); using (SqlCommand cmd = new SqlCommand("sp_Add_Car", con)) { try { cmd.CommandType = CommandType.StoredProcedure; //...... con.Open(); cmd.ExecuteNonQuery(); con.Close(); dtCar.Clear(); da.Fill(dtCar); } catch (Exception ex) { MessageBox.Show(ex.Message + "\t" + ex.Source); } } } refreshCar(); } </code></pre> This is the code of an another button working well without error <pre><code>private void btnAddPayment_Click(object sender, EventArgs e) { using (SqlConnection con = new SqlConnection(dc.Con)) { DataTable dtPayment = new DataTable(); using (SqlCommand cmd = new SqlCommand("sp_Add_Paiements", con)) { try { cmd.CommandType = CommandType.StoredProcedure; cmd.Parameters.Add("@id_paiement", SqlDbType.Char).Value = txtBoxPaymentId.Text; cmd.Parameters.Add("@montant", SqlDbType.SmallMoney).Value = txtBoxAmount.Text; cmd.Parameters.Add("@id_Location", SqlDbType.Char).Value = cmbpaymentLesaseId.Text; //cmd.Parameters.Add("@status", SqlDbType.Char).Value = txtBoxStatusPayment.Text; con.Open(); cmd.ExecuteNonQuery(); con.Close(); dtPayment.Clear(); da.Fill(dtPayment); btnAddLease.Hide(); refreshPayments(); } catch (Exception ex) { MessageBox.Show(ex.Message + "\t" + ex.Source); } } } btnAddPayment.Hide(); } </code></pre>
Tags
<c#><ado.net>
Title
Connection string property has not be initialized
singulars
PostAcceptedAnswerId
1. PO
 singulars
 PostTypePostTypeId
 PTAnswer
PostParentId
1. This table or related slice is empty.
PostTypePostTypeId
1. PTQuestion
UserLastEditorUserId
1. USLarsTech
UserOwnerUserId
1. USFrankSharp
plurals
PostLinksPostIdRelatedPostId
1. This table or related slice is empty.
PostLinksRelatedPostIdPostId
1. This table or related slice is empty.
PostsAcceptedAnswerId
1. This table or related slice is empty.
PostsParentIdCreationDate
1. PO
 singulars
 PostTypePostTypeId
 PTAnswer
2. PO
 singulars
 PostTypePostTypeId
 PTAnswer
3. PO
 singulars
 PostTypePostTypeId
 PTAnswer
VotesPostIdCreationDate
1. This table or related slice is empty.
CommentsPostId

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