save button click event getting fired up on refreshing the page once done with binding the data to a gridview through save button in asp.net

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C#

ASP.NET

Gridview

I am working on a web application using asp.net and c#.net. am binding the data to the gridview through the textboxes in the same page and I wrote the binding method in my "Save" button click event. Now, Its really strange thing to find that the grid view is getting binded again with duplicate rows once I refresh the page up on saving the data to the gridveiw from textboxes through "save" button_click event. I have tried loading the page on firefox, chrome and IE 8....but the result is negative....

could anyone let me know why is it happening and guide me to resolve it....

the following is my c# code:

string con = ConfigurationSettings.AppSettings["ConnectionStrings"];
protected void Page_Load(object sender, EventArgs e)
    {
        
        tbladdasset.Visible = false;
        btnsaveasset.Enabled = false;
        lblErrMsg.Text = "";
        
        if (!IsPostBack)
        {
            bindassets("", "");
            ViewState["sortOrder"] = "";
           
        }

    }


    private void bindassets(string sortExp, string sortDir)
    {
        try
        {
            SqlConnection con1 = new SqlConnection(con);
            con1.Open();
            SqlCommand cmd = new SqlCommand("select Description,CONVERT(VARCHAR(10), RecievedDate, 101) as DateRecieved,cost,Modelno,Quantity from Asset", con1);
            SqlDataAdapter da = new SqlDataAdapter(cmd);
            DataTable dt = new DataTable();
            da.Fill(dt);
            con1.Close();
            if (dt.Rows.Count > 0)
            {
                DataView dv = dt.DefaultView;
                if (sortExp != string.Empty)
                {
                    dv.Sort = string.Format("{0} {1}", sortExp, sortDir);
                }
                grdvAssets.DataSource = dv;
                grdvAssets.DataBind();
                
            }
            else
            {
                lblErrMsg.Text = "No data found...";
            }
            btnsaveasset.Enabled = false;
            tbladdasset.Visible = false;
        }
        catch
        {
            lblErrMsg.Text = "Failed to connect server...";
        }

    }

 protected void btnaddnew_Click(object sender, EventArgs e)
    {
        tbladdasset.Visible = true;
        btnsaveasset.Enabled = true;
        lblErrMsg.Text = "";
        txtdescription.Text = "";
        txtdtrecieved.Text = "";
        txtcost.Text = "";
        txtmodelno.Text = "";
        txtquantity.Text = "";
      
    }

    protected void btnsaveasset_Click(object sender, EventArgs e)
    {
            if (txtdescription.Text != "" && txtdtrecieved.Text != "" && txtcost.Text != "" && txtmodelno.Text != "" && txtquantity.Text != "")
            {
                try
                {
                    string desc= txtdescription.Text;
                    DateTime dtrecd = Convert.ToDateTime(txtdtrecieved.Text);
                    string cost = txtcost.Text;
                    string modelno = txtmodelno.Text;
                    double quantity = Convert.ToDouble(txtquantity.Text);
                    SqlConnection sqlcon = new SqlConnection(con);
                    sqlcon.Open();
                    string save = "Insert into Asset(Description,Recieveddate,cost,Modelno,Quantity)values(@desc,@date,@cost,@modelno,@quantity)";
                    SqlCommand cmd = new SqlCommand(save, sqlcon);
                    cmd.CommandType = CommandType.Text;
                    cmd.Parameters.Add("@desc", desc);
                    cmd.Parameters.Add("@date", dtrecd);
                    cmd.Parameters.Add("@cost", cost);
                    cmd.Parameters.Add("@modelno", modelno);
                    cmd.Parameters.Add("@quantity", quantity);
                    cmd.ExecuteNonQuery();
                    sqlcon.Close();
                    bindassets("", "");
                    btnsaveasset.Enabled = false;
                    txtdescription.Text = "";
                    txtdtrecieved.Text = "";
                    txtcost.Text = "";
                    txtmodelno.Text = "";
                    txtquantity.Text = "";
                    lblErrMsg.Text = "data inserted successfully..";
                }
                catch
                {
                    lblErrMsg.Text = "Please enter valid data and try again...";
                }
            }
            else
            {
                lblErrMsg.Text = "Please enter valid data and try again...";
            }
       
    }

    protected void grdvAssets_Sorting(object sender, GridViewSortEventArgs e)
    {
        bindassets(e.SortExpression, sortOrder);
    }

    public string sortOrder
    {
        get
        {
            if (ViewState["sortOrder"].ToString() == "desc")
            {
                ViewState["sortOrder"] = "asc";
            }
            else
            {
                ViewState["sortOrder"] = "desc";
            }

            return ViewState["sortOrder"].ToString();
        }
        set
        {
            ViewState["sortOrder"] = value;
        }
    }

anyone please help me...thanks in advance.