[FormatException: Input string was not in a correct format.]
System.Number.StringToNumber(String str, NumberStyles options, NumberBuffer& number, NumberFormatInfo info, Boolean parseDecimal) +14542542
System.Number.ParseInt32(String s, NumberStyles style, NumberFormatInfo info) +174
System.String.System.IConvertible.ToInt32(IFormatProvider provider) +58
System.Convert.ChangeType(Object value, TypeCode typeCode, IFormatProvider provider) +417
System.Web.UI.WebControls.Parameter.GetValue(Object value, String defaultValue, TypeCode type, Boolean convertEmptyStringToNull, Boolean ignoreNullableTypeChanges) +151
System.Web.UI.WebControls.Parameter.GetValue(Object value, Boolean ignoreNullableTypeChanges) +94
System.Web.UI.WebControls.ParameterCollection.GetValues(HttpContext context, Control control) +309
System.Web.UI.WebControls.ObjectDataSourceView.ExecuteSelect(DataSourceSelectArguments arguments) +294
System.Web.UI.DataSourceView.Select(DataSourceSelectArguments arguments, DataSourceViewSelectCallback callback) +26
Telerik.Web.UI.RadComboBox.OnDataBinding(EventArgs e) +1744
Telerik.Web.UI.RadComboBox.PerformSelect() +60
Telerik.Web.UI.RadComboBox.DataBind() +128
Student_Control_Reserve.Page_Load(Object sender, EventArgs e) +219
System.Web.UI.Control.OnLoad(EventArgs e) +108
System.Web.UI.Control.LoadRecursive() +90
System.Web.UI.Control.LoadRecursive() +185
System.Web.UI.Control.LoadRecursive() +185
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1533
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