How to fix "'ServerVersion' threw an exception of type 'System.InvalidOperationException'"? [duplicate]

Step 1: go to WebConfig File and Write this Code:

enter code here <connectionStrings> <add name ="MyDbConn" ---> write same it is      connectionString="Server=SYED\SQLEXPRESS; database=Templete_2_DB;      Trusted_Connection=True" providerName="System.data.sqlclient"     />  </connectionStrings>

code here

SYED\SQLEXPRESS; ---> this is your servernameTemplete_2_DB; ----> this is your database name

step 2: Go to your page event and write code like this..

enter code here SqlConnection con = new SqlConnection( WebConfigurationManager.ConnectionStrings["MyDbConn"].ConnectionString); SqlCommand cmd = new SqlCommand("select * from Accounts_Data where  UserName=@username and Password=@password", con);        cmd.Parameters.AddWithValue("@username", txt_username.Text);        cmd.Parameters.AddWithValue("@password", txt_userPassword.Text);        SqlDataAdapter sda = new SqlDataAdapter(cmd);        DataTable dt = new DataTable();        sda.Fill(dt);        con.Open();        int i = cmd.ExecuteNonQuery();        con.Close();        if (dt.Rows.Count > 0)        {            Response.Redirect("Default.aspx");        }

code here

Go ahead... in this you will be guided

https://www.youtube.com/watch?v=Mo0ECWKVVDU

Create a method:

private void connection(){    con = new SqlConnection(ConfigurationManager.ConnectionStrings["conStrSheebu"].ConnectionString);}

set in web.config as:

<connectionStrings>    <add name="conStrSheebu" connectionString="Data Source=(local);Initial Catalog=Sheebu;User ID=sa;Password = AnsarI" providerName="System.Data.SqlClient" /></connectionStrings>