Sql connection error

Question

1.00/5 (1 vote)

See more:

Two Query is under blow first is main Connection

Query 1 Run is Correct no error

Query 2 Error is

Value type string can't be converted to system.data.SqlClient.SqlConnection

What I have tried:

Main Query

Dim SqlConnection As String = ConfigurationManager.ConnectionStrings("RMS.My.MySettings.SoftlinksStupConnection").ConnectionString
System.Configuration.ConfigurationManager.AppSettings.Get("SQLSqriptRead")

Query 1

 Dim da_Product_Items = New SqlClient.SqlDataAdapter("Select Name,Address,Phone from dbo.Script order by Name", SqlConnection)
 da_Product_Items.Fill(ds_Product_Items, "Script") 'Change items to your database name

Query 2

Dim Check_User_Name_Found As New SqlClient.SqlCommand("SELECT Max(User_Name) FROM SQLDatabase.dbo.Administrator_Account", SqlConnection)
Dim Check_UserNameFound = Check_User_Name_Found.ExecuteScalar().ToString()

Posted 18-Sep-18 7:00am

Computechsoft

Updated 18-Sep-18 7:26am

Add a Solution

Comments

Computechsoft 18-Sep-18 14:08pm

This Ok but i want Vb.net

Richard Deeming 18-Sep-18 16:40pm

You've posted this as a reply to your question. I suspect you meant to post it as a reply to Solution 1 instead.

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

ZurdoDev · Accepted Answer · 2018-09-18T07:27:00

The error is telling you that you can't convert a String into a SqlConnection. So, you are passing a string in as the second parameter to the SqlCommand constructor. You need to pass a SqlConnection, not just the Connection String.

SqlCommand Constructor (System.Data.SqlClient) | Microsoft Docs[^]

However, the better approach is to use the using statement, something like this:

C#

using (SqlConnection con = new SqlConnection(connectionString))
{
    using (SqlCommand cmd = new SqlCommand("SELECT ...", con)) // notice, pass the actual SqlConnection and not the string of the connection.
    {
    }
}

This sample is in C#. But the main point is to pass the proper parameter.