[Solved] Passing data between dropdownlist and gridview using datatable and viewstate

See more:

C#

ASP.NET

Gridview

ViewState

, +

Solve this issue regarding dropdownlist and gridview. The scenario is as following: I have one dropdownlist and one gridview. Data from database is binding to dropdownlist. now dropdownlist has 1000+ employee names in DataTextField and employee emails in DataValueField. there is an ADD button with dropdownlist and when I add the selected item from dropdownlist it comes to gridview with autogenerated sr.no, empname(datatextfield) and email(datavaluefield) and one column of command field(DELETE Button) in the gridview. The issue is that when the selected item has been entered in the gridview from dropdownlist, it should be removed from the dropdownlist and when i delete such record from the gridview it should go back to dropdownlist. "Using 02 different Datatables for Dropdownlist and Gridview for binding data and viewstates as well."

THIS IS THE ADDBUTTON CODING ON WHICH THE DATA IS BEING INSERTED IN GRIDVIEW.

protected void addemp_Click(object sender, EventArgs e)
{
        DataTable empemails = new DataTable();
        int srno = 1;
        empemails.Columns.Add("Sr.No");
        empemails.Columns.Add("EmpName");
        empemails.Columns.Add("Email");
        foreach (GridViewRow gvRow2 in GridView2.Rows)
        {
            empemails.Rows.Add();
            empemails.Rows[empemails.Rows.Count - 1][0] = gvRow2.Cells[0].Text; // empname
            empemails.Rows[empemails.Rows.Count - 1][1] = gvRow2.Cells[1].Text; // empname
            empemails.Rows[empemails.Rows.Count - 1][2] = gvRow2.Cells[2].Text; // emails
        }
        empemails.Rows.Add();
        empemails.Rows[empemails.Rows.Count - 1][0] = srno.ToString();
        empemails.Rows[empemails.Rows.Count - 1][2] = DropDownList2.SelectedItem;
        empemails.Rows[empemails.Rows.Count - 1][2] = DropDownList2.SelectedValue;
        ViewState["CurrentTable"] = empemails;
        GridView2.DataSource = ViewState["CurrentTable"] as DataTable;
        GridView2.DataBind();
    }
}

THIS IS THE CODE ON WHICH DROPDOWNLIST DATA IS BINDED FROM THE DATABASE

protected void empemailbind()
{
    DataTable adp3 = new DataTable();
    OracleConnection dbConn = Conn.getConnection();
    string query3 = "select email,details from EmployeeTABLE";
    OracleCommand cmd3 = new OracleCommand(query3, dbConn);
    dbConn.Open();
    OracleDataAdapter dr3 = new OracleDataAdapter(cmd3);
    dr3.Fill(adp3);
    DropDownList2.DataSource = adp3;
    DropDownList2.DataTextField = "detail";
    DropDownList2.DataValueField = "email";
    DropDownList2.DataBind();
    dbConn.Close();
}

THIS IS THE CODE ON WHICH ROW_DELETING IS BEING PERFORMED IN THE GRIDVIEW.

protected void GridView2_RowDeleting(object sender, GridViewDeleteEventArgs e)
{
    //LinkButton button = (LinkButton)GridView2.FindControl("(X)");
    DataTable dt = ViewState["CurrentTable"] as DataTable;
    //
    int rowIndex = Convert.ToInt32(e.RowIndex);
    if (dt.Rows.Count >= 0)
    {
        dt.Rows[rowIndex].Delete();
    }
    ViewState["CurrentTable"] = dt;
    GridView2.DataSource = ViewState["CurrentTable"] as DataTable;
    GridView2.DataBind();
}

help.. Thanks.