网格视图更新错误发生连接未关闭。连接的当前状态是打开的。

问题描述

protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e)
    {
 string Sno = ((TextBox)GridView1.Rows[e.RowIndex]
                            .FindControl("txtSno")).Text;
        string Name = ((TextBox)GridView1.Rows[e.RowIndex]
                            .FindControl("txtName")).Text;
        string Age = ((TextBox)GridView1.Rows[e.RowIndex]
                            .FindControl("txtage")).Text;
        string Address = ((TextBox)GridView1.Rows[e.RowIndex].FindControl("txtaddress")).Text;
        SqlConnection con = new SqlConnection("Server=(local);initial catalog=master;Trusted_Connection=True");
        con.Open();
        SqlCommand cmd = new SqlCommand();
        cmd.CommandType = CommandType.Text;
        cmd.CommandText = "update Details set Sno=@Sno, Name=@Name," +
     "Age=@Age where Sno=@Sno;" +
     "select Sno,Name,Age,Address from Details";
        cmd.Parameters.Add("@Sno", SqlDbType.Int).Value = Sno;
        cmd.Parameters.Add("@Name", SqlDbType.VarChar).Value = Name;
        cmd.Parameters.Add("@Age", SqlDbType.VarChar).Value = Age;
        cmd.Parameters.Add("@Address", SqlDbType.VarChar).Value = Address;
        cmd.Connection = con;
        con.Open();
        cmd.ExecuteNonQuery();
        SqlCommand cmd1 = new SqlCommand("Select * from Details", con);
        SqlDataAdapter adp = new SqlDataAdapter(cmd1);
        DataSet ds = new DataSet();
        adp.Fill(ds);
        con.Close();
        GridView1.DataSource = ds;
        GridView1.DataBind();
}

错误发生如下;连接没有关闭。连接的当前状态是开放的。



请帮助我。从我上面的代码是什么问题。

The Error occurs as follows; The connection was not closed. The connection''s current state is open.

please help me. from my above code what is the problem.

推荐答案

protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e)
    {
 string Sno = ((TextBox)GridView1.Rows[e.RowIndex]
                            .FindControl("txtSno")).Text;
        string Name = ((TextBox)GridView1.Rows[e.RowIndex]
                            .FindControl("txtName")).Text;
        string Age = ((TextBox)GridView1.Rows[e.RowIndex]
                            .FindControl("txtage")).Text;
        string Address = ((TextBox)GridView1.Rows[e.RowIndex].FindControl("txtaddress")).Text;
        SqlConnection con = new SqlConnection("Server=(local);initial catalog=master;Trusted_Connection=True");
        con.Open();
        SqlCommand cmd = new SqlCommand();
        cmd.CommandType = CommandType.Text;
        cmd.CommandText = "update Details set Sno=@Sno, Name=@Name," +
     "Age=@Age where Sno=@Sno;" +
     "select Sno,Name,Age,Address from Details";
        cmd.Parameters.Add("@Sno", SqlDbType.Int).Value = Sno;
        cmd.Parameters.Add("@Name", SqlDbType.VarChar).Value = Name;
        cmd.Parameters.Add("@Age", SqlDbType.VarChar).Value = Age;
        cmd.Parameters.Add("@Address", SqlDbType.VarChar).Value = Address;
        cmd.Connection = con;
        con.Open();
        cmd.ExecuteNonQuery();
        SqlCommand cmd1 = new SqlCommand("Select * from Details", con);
        SqlDataAdapter adp = new SqlDataAdapter(cmd1);
        DataSet ds = new DataSet();
        adp.Fill(ds);

        GridView1.DataSource = ds;
        GridView1.DataBind();
con.Close(); // it comes here
}

if(con.State = ConnectionState.Closed)
con.open

而不是你的代码

instead of your code

con.Open

实际上 你正在调用con.open（）方法两次。因此，删除con声明旁边的con.open（）。

Actually you are calling con.open() method twice. So delete con.open() next to the declaration of "con".

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