Unable to connect database

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i created a login form but not able to connect the database.It shows the below error

Instance failure.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.InvalidOperationException: Instance failure.

Source Error:

Line 27: cmd.Parameters.AddWithValue("@UserName", txtUserName.Text);
Line 28: cmd.Parameters.AddWithValue("@Password", txtPWD.Text);
Line 29: con.Open();
Line 30: SqlDataAdapter da = new SqlDataAdapter(cmd);
Line 31: DataTable dt = new DataTable();

Posted 26-Sep-13 18:24pm

vanarajranjit

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uspatel · Answer 1 · 2013-09-26T18:40:00

Solution 1

Check your instance is working.
try to connect sql server with these steps
Database connectivity with Oracle,SQL Server and MS Access using Visual Studio

if it connected successfully then use same connection string careted after following given steps.

Posted 26-Sep-13 18:40pm

uspatel

indrajeet jadhav · Answer 2 · 2013-09-26T19:05:00

Solution 2

Line 29: con.Open();
Line 27: cmd.Parameters.AddWithValue("@UserName", txtUserName.Text);
Line 28: cmd.Parameters.AddWithValue("@Password", txtPWD.Text);
Line 30: SqlDataAdapter da = new SqlDataAdapter(cmd);
Line 31: DataTable dt = new DataTable();

Try this..You need to open connection firstly

Posted 26-Sep-13 19:05pm

indrajeet jadhav

Comments

vanarajranjit 27-Sep-13 1:28am

How to do ?

indrajeet jadhav 27-Sep-13 1:29am

I posted the code
..is that not working?