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Error in inserting record

Posted on 2008-06-15
8
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Last Modified: 2013-12-17
I have code as listed below. This code is working perfectly if i use MS Access (oleDbConnection) but it giving me error when i convert to use sql server 2005 express edition.
protected void btnAdd_Click(object sender, EventArgs e)
    {
 
        SqlConnection conNwind;
        SqlCommand cmdSelect, cmdSelectID;
        SqlDataReader dtrCustomer;
 
 
        string connStr = ConfigurationManager.ConnectionStrings["ConnectionNWind"].ConnectionString;
        conNwind = new SqlConnection(connStr);
 
 
        conNwind.Open();
 
        string select = "Select * from Customers where CustomerID=@ID";
        cmdSelectID = new SqlCommand(select, conNwind);
 
        cmdSelectID.Parameters.AddWithValue("@ID", txtId.Text);
        dtrCustomer = cmdSelectID.ExecuteReader();
 
 
        if (dtrCustomer.Read())
        {
            Label1.Text = "ID already exist!";
 
        }
 
        else
        {
            string strInsert = "Insert into Customers(CustomerID,Companyname,Contactname,Phone) values(@customerId,@companyname,@contactname,@phone)";
 
            cmdSelect = new SqlCommand(strInsert, conNwind);
 
            cmdSelect.Parameters.AddWithValue("@customerId", txtId.Text);
            cmdSelect.Parameters.AddWithValue("@companyname", txtCompanyName.Text);
            cmdSelect.Parameters.AddWithValue("@contactname", txtContactName.Text);
            cmdSelect.Parameters.AddWithValue("@phone", txtPhone.Text);
 
            int intAdd = cmdSelect.ExecuteNonQuery();
 
            if (intAdd != 0)
                Label1.Text = "Record successfully added into database!";
 
            else
                Label1.Text = "Record not added into database!";
        }
 
        dtrCustomer.Close();
        conNwind.Close();
 
    }

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Question by:nisha_
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8 Comments
 
LVL 53

Expert Comment

by:Dhaest
ID: 21791138
Where do you get an error and what error do you get when you change it to sql server 2005 express edition?
0
 

Author Comment

by:nisha_
ID: 21791143
Error message : There is already an open DataReader associated with this Command which must be closed first.
0
 
LVL 53

Accepted Solution

by:
Dhaest earned 250 total points
ID: 21791219
Where do you get that error ? Can you try this.
protected void btnAdd_Click(object sender, EventArgs e)
    {
 
        SqlConnection conNwind;
        SqlCommand cmdSelect, cmdSelectID;
        SqlDataReader dtrCustomer;
 
 
        string connStr = ConfigurationManager.ConnectionStrings["ConnectionNWind"].ConnectionString;
        conNwind = new SqlConnection(connStr);
 
 
        conNwind.Open();
 
        string select = "Select * from Customers where CustomerID=@ID";
        cmdSelectID = new SqlCommand(select, conNwind);
 
        cmdSelectID.Parameters.AddWithValue("@ID", txtId.Text);
        dtrCustomer = cmdSelectID.ExecuteReader();
 
 
        if (dtrCustomer.Read())
        {
            Label1.Text = "ID already exist!";
            dtrCustomer.Close();
        }
 
        else
        {
            dtrCustomer.Close();
            string strInsert = "Insert into Customers(CustomerID,Companyname,Contactname,Phone) values(@customerId,@companyname,@contactname,@phone)";
 
            cmdSelect = new SqlCommand(strInsert, conNwind);
 
            cmdSelect.Parameters.AddWithValue("@customerId", txtId.Text);
            cmdSelect.Parameters.AddWithValue("@companyname", txtCompanyName.Text);
            cmdSelect.Parameters.AddWithValue("@contactname", txtContactName.Text);
            cmdSelect.Parameters.AddWithValue("@phone", txtPhone.Text);
 
            int intAdd = cmdSelect.ExecuteNonQuery();
 
            if (intAdd != 0)
                Label1.Text = "Record successfully added into database!";
 
            else
                Label1.Text = "Record not added into database!";
        }
         
        conNwind.Close();
 
    }

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LVL 7

Expert Comment

by:AUmidh
ID: 21791221
make a try of the following
add this statement dtrCustomer.Close();
before the following.
string strInsert = "Insert into Customers(CustomerID,Companyname,Contactname,Phone) values(@customerId,@companyname,@contactname,@phone)";

I am not sure about this but may be.


0
 
LVL 19

Expert Comment

by:elimesika
ID: 21791226
Try
     SqlConnection conNwind;
        SqlCommand cmdSelect, cmdSelectID;
        SqlDataReader dtrCustomer;
 
 
        string connStr = ConfigurationManager.ConnectionStrings["ConnectionNWind"].ConnectionString;
        conNwind = new SqlConnection(connStr);
 
 
        conNwind.Open();
 
        string select = "Select * from Customers where CustomerID=@ID";
        cmdSelectID = new SqlCommand(select, conNwind);
 
        cmdSelectID.Parameters.AddWithValue("@ID", txtId.Text);
        dtrCustomer = cmdSelectID.ExecuteReader();
 
 
        if (dtrCustomer.Read())
        {
            Label1.Text = "ID already exist!";
            dtrCustomer.Close();
            conNwind.Close();
 	    return;
        }
 
        else
        {
            dtrCustomer.Close();
            string strInsert = "Insert into Customers(CustomerID,Companyname,Contactname,Phone) values(@customerId,@companyname,@contactname,@phone)";
 
            cmdSelect = new SqlCommand(strInsert, conNwind);
 
            cmdSelect.Parameters.AddWithValue("@customerId", txtId.Text);
            cmdSelect.Parameters.AddWithValue("@companyname", txtCompanyName.Text);
            cmdSelect.Parameters.AddWithValue("@contactname", txtContactName.Text);
            cmdSelect.Parameters.AddWithValue("@phone", txtPhone.Text);
 
            int intAdd = cmdSelect.ExecuteNonQuery();
 
            if (intAdd != 0)
                Label1.Text = "Record successfully added into database!";
 
            else
                Label1.Text = "Record not added into database!";
                
            conNwind.Close();
        }
 

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0
 

Author Comment

by:nisha_
ID: 21791255
putting dtrCustomer.Read() before insert statement make the program work. But why i should do like that since my insert statement not using data reader.
0
 
LVL 53

Expert Comment

by:Dhaest
ID: 21791298
A datareader opens a transaction. As long as it's not commited (or closed), the connection will be exclusive used by your datareader.
0
 

Author Comment

by:nisha_
ID: 21791307
Then how it can work in MS Access even i closed the datareader after insert statement?
0

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