Error while converting string to SqlConnection [ANSWERED]

Error while converting string to SqlConnection

Asked By: Lost_in_CS
Originally Asked On: 2014-01-05 19:38:58
Asked Via: stackoverflow

I’m getting this error:

Cannot implicitly convert type string to System.Data.SqlClient.SqlConnection

Here is my C# code.

protected void Button1_Click(object sender, EventArgs e)
{
  //login button
  SqlConnection sqlConn = "Your Conncetion String"; //The error is here
  sqlConn.Open();

  SqlCommand sqlComm = new SqlCommand();
  sqlComm.CommandText = String.Format("select * from users where userName=@userName and password=@password");
  sqlComm.Parameters.AddWithValue("@userName", TextBox1.Text.Trim());
  sqlComm.Parameters.AddWithValue("@password", TextBox2.Text.Trim());
  sqlComm.CommandType = CommandType.Text;
  sqlComm.Connection = sqlConn;
  SqlDataReader sqlRead = sqlComm.ExecuteReader();
  if (sqlRead.Read())
  {
    Session["username"] = sqlRead["username"];
  }

  // SqlRead.Close();

  //sqlConn1.Close();

  Response.Redirect("Default.aspx");

}

Can someone explain what this error means and how to fix it?

He received 3 answers
eventually accepting:

‘s answer to

Error while converting string to SqlConnection

The answer with the highest score with 5 points was:

Szymon’s answer to

Error while converting string to SqlConnection

I understand you have a connection string and want a SqlConnection object. You can use one of its constructors:

string connString = "Your Conncetion String"; // valid connection string
var sqlConn = new SqlConnection(connString);

It will be best if you use using keyword as this will take care of closing the connection properly. You should also use using for your SqlReader.

using (var sqlConn = new SqlConnection(connString))
{
    sqlConn.Open();
    // the rest of the code
}

If the selected answer did not help you out, the other answers might!

All Answers For: Error while converting string to SqlConnection

Szymon’s answer to

Error while converting string to SqlConnection

I understand you have a connection string and want a SqlConnection object. You can use one of its constructors:

string connString = "Your Conncetion String"; // valid connection string
var sqlConn = new SqlConnection(connString);

It will be best if you use using keyword as this will take care of closing the connection properly. You should also use using for your SqlReader.

using (var sqlConn = new SqlConnection(connString))
{
    sqlConn.Open();
    // the rest of the code
}

Ashley Medway’s answer to

Error while converting string to SqlConnection

Change

SqlConnection sqlConn = "Your Conncetion String"; 

To

SqlConnection sqlConn = new SqlConnection("Your Conncetion String");

meda’s answer to

Error while converting string to SqlConnection

it should be

SqlConnection sqlConn = new SqlConnection("Your Conncetion String");

You can read it from web.config

SqlConnection sqlConn = new  
SqlConnection(ConfigurationManager.ConnectionStrings["Connection"].ConnectionString);

---

now this error The name ‘ConfigurationManager’ does not exist in the current context

1. You have to add a reference to the System.Configuration.dll

2. then add using System.Configuration; to your class.

3. You can now access your config file like this:

   ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;

Of course, you should really check out the original question.

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