Timeout expired. The timeout period elapsed prior to obtaining a connection from the pool.

I keep getting the following errors on one of my application sites after clicking for many times:

"Timeout expired: The timeout period elapsed prior to obtaining a connection from the pool. This may have occurred because all pooled connections were in use and max pool size was reached."


Below was my code:

SqlConnection conn = new SqlConnection(DataAccess.GetConnectionString());

conn.Open();

SqlDataSource1.SelectCommand = sql;

SqlDataSource1.SelectParameters.Clear();

Repeater1.DataSource = SqlDataSource1;

Repeater1.DataSourceID = string.Empty;

Repeater1.DataBind();

conn.Close();

I found later, this typically happens when connections are not closed after they are used. You should put everything in a try/catch/finally, with the connection being closed in the Finally to ensure that it always gets closed no mater what.

Hence the solution is:

SqlConnection conn = new SqlConnection(DataAccess.GetConnectionString());

conn.Open();

try

{

SqlDataSource1.SelectCommand = sql;

SqlDataSource1.SelectParameters.Clear();

Repeater1.DataSource = SqlDataSource1;

Repeater1.DataSourceID = string.Empty;

Repeater1.DataBind();

}

finally

{

SqlConnection.ClearPool(conn);

SqlConnection.ClearAllPools();

}

Note: If there is any return statement before you close the connection, there might be a connection leak ; be careful on that.

Return value from stored procedure to c#

Suppose you have a stored procedure which returns a bit value 0 or 1. If you want to call that procedure from c# and get that bit value, do like this below:

let say, the stored procedure has:

Name: dbo.sp_dateCheck

Variables:

@laptop varchar(50),

@startdate DateTime,

@enddate DateTime

and return bit variable: @CondFlag

SqlCommand com = new SqlCommand("dbo.sp_dateCheck", conn);

com.CommandType = CommandType.StoredProcedure;

try

{

conn.Open();

com.Parameters.Add(new SqlParameter("@laptop", Laptop.Text));

com.Parameters.Add(new SqlParameter("@startdate", startDate. DateTime));

com.Parameters.Add(new SqlParameter("@enddate", endDate. DateTime));

//read the returned value from stored procedure

com.Parameters.Add("@CondFlag", SqlDbType.Bit);

com.Parameters["@CondFlag"].Direction = ParameterDirection.ReturnValue;

com.ExecuteNonQuery();

int ReturnedVal = (int)com.Parameters["@CondFlag"].Value;

if (ReturnedVal == 0)

{ // do this

}

else

{//do this

}

}

catch

{

}

Happy Programming!!!