connection string running out of connection pooling

Question

Hi, I have a webform application, when I access the website, things works fine. but when multiple people access the site, it gives me a message that I have exceeded the connection pooling . 

I revised my code accessing the database with  the folling one. Still I am having same problem. Any idea how to prevent exceeling connection pool .

 

thanks for your support

public static string conStr = WebConfigurationManager.ConnectionStrings["conStrKfmc"].ConnectionString;
public SqlConnection con = new SqlConnection(WebConfigurationManager.ConnectionStrings["conStrKfmc"].ConnectionString);
public DataSet getDataSetPassSql(string mySql)
{
DataSet ds;
using (SqlConnection cn = new SqlConnection(conStr))
{
using (SqlCommand cmd = new SqlCommand(mySql, cn))
{
SqlDataAdapter da = new SqlDataAdapter(cmd);
ds = new DataSet();
using (cn)
{
cn.Open();
da.Fill(ds);
return ds;
}
}
}
}
public int InsertUpdateDelete(string mySql, Dictionary myPara)
{
int rtn = 0;
using (SqlCommand cmd = new SqlCommand(mySql, con))
{
cmd.CommandType = CommandType.Text;
foreach (KeyValuePair p in myPara)
{
cmd.Parameters.AddWithValue(p.Key, p.Value);
}
using (con)
{
con.Open();
rtn = cmd.ExecuteNonQuery();
con.Close();
}
}
return rtn;
}

Thanks for your support