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POException Details: System.FormatException: Input string was not in a correct format
 

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  1. POException Details: System.FormatException: Input string was not in a correct format
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    <p>i'm populating dropdownlist based upon the other dropdownlist.. When I select a value in the 1st dropdownlist i keep getting this error..</p> <p>can someone explain it to me.. here's the code..</p> <pre><code>using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.UI; using System.Web.UI.WebControls; using System.Configuration; using System.Data.SqlClient; using System.Data; public partial class _Default : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { if (!IsPostBack) { FillCountry(); } } protected void ddlCountry_SelectedIndexChanged(object sender, EventArgs e) { int CountryID = Convert.ToInt32(ddlCountry.SelectedValue.ToString()); FillStates(CountryID); ddlCity.SelectedIndex = 0; } protected void ddlState_SelectedIndexChanged(object sender, EventArgs e) { int StateID = Convert.ToInt32(ddlState.SelectedValue.ToString()); FillCities(StateID); } private void FillCountry() { string strConn = ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString; SqlConnection con = new SqlConnection(strConn); SqlCommand cmd = new SqlCommand(); cmd.Connection = con; cmd.CommandType = CommandType.Text; cmd.CommandText = "SELECT CountryID, CountryName FROM Country"; DataSet objDs = new DataSet(); SqlDataAdapter dAdapter = new SqlDataAdapter(); dAdapter.SelectCommand = cmd; con.Open(); dAdapter.Fill(objDs); con.Close(); if (objDs.Tables[0].Rows.Count &gt; 0) { ddlCountry.DataSource = objDs.Tables[0]; ddlCountry.DataTextField = "CountryName"; ddlCountry.DataValueField = "CountryID"; ddlCountry.DataBind(); ddlCountry.Items.Insert(0, "--Select--"); } else { lblMsg.Text = "No Countries found"; } } private void FillStates(int countryID) { string strConn = ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString; SqlConnection con = new SqlConnection(strConn); SqlCommand cmd = new SqlCommand(); cmd.Connection = con; cmd.CommandType = CommandType.Text; cmd.CommandText = "SELECT StateID, StateName FROM State WHERE CountryID =@CountryID"; cmd.Parameters.AddWithValue("@CountryID", countryID); DataSet objDs = new DataSet(); SqlDataAdapter dAdapter = new SqlDataAdapter(); dAdapter.SelectCommand = cmd; con.Open(); dAdapter.Fill(objDs); con.Close(); if (objDs.Tables[0].Rows.Count &gt; 0) { ddlState.DataSource = objDs.Tables[0]; ddlState.DataTextField = "StateName"; ddlState.DataValueField = "StateID"; ddlState.DataBind(); ddlState.Items.Insert(0, "--Select--"); } else { lblMsg.Text = "No states found"; } } private void FillCities(int stateID) { string strConn = ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString; SqlConnection con = new SqlConnection(strConn); SqlCommand cmd = new SqlCommand(); cmd.Connection = con; cmd.CommandType = CommandType.Text; cmd.CommandText = "SELECT CityID, CityName FROM City WHERE StateID =@StateID"; cmd.Parameters.AddWithValue("@StateID", stateID); DataSet objDs = new DataSet(); SqlDataAdapter dAdapter = new SqlDataAdapter(); dAdapter.SelectCommand = cmd; con.Open(); dAdapter.Fill(objDs); con.Close(); if (objDs.Tables[0].Rows.Count &gt; 0) { ddlCity.DataSource = objDs.Tables[0]; ddlCity.DataTextField = "CityName"; ddlCity.DataValueField = "CItyID"; ddlCity.DataBind(); ddlCity.Items.Insert(0, "--Select--"); } else { lblMsg.Text = "No Cities found"; } } } </code></pre> <p>i think my problem is the line here..</p> <pre><code>int CountryID = Convert.ToInt32(ddlCountry.SelectedValue.ToString()); </code></pre> <p>im using varchar datatype for all of my tables..</p>
    singulars
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PTQuestion
    1. USBrian Mains
    1. USdrayl
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
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      1. PTAnswer
    2. PO
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      1. PTAnswer
    1. This table or related slice is empty.
    1. COSo `ddlCountry.SelectedValue` is not a valid `Int32`
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      1. POException Details: System.FormatException: Input string was not in a correct format
      1. USShai
    2. COCountryID column should be numeric
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      1. POException Details: System.FormatException: Input string was not in a correct format
      1. USDor Cohen
    3. COthanks for a quick reply.. but can you please elaborate it.. im new to c#..
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      1. POException Details: System.FormatException: Input string was not in a correct format
      1. USdrayl
 

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