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

Hello all,

I'm looking for a long time to find out what's wrong, but I can't find the mistake...
The connection to the database works correctly (Select,..), but when I set up the Insert-Command by clicking a button I get the following exception. Does anybody can help me and tell me what's wrong?!

Thank you for helping!

Exception:
System.FormatException: Input string was not in a correct format. at System.Number.ParseInt32(String s, NumberStyles style, NumberFormatInfo info) at System.String.System.IConvertible.ToInt32(IFormatProvider provider) at System.Convert.ChangeType(Object value, Type conversionType, IFormatProvider provider) at System.Data.OleDb.OleDbParameter.GetParameterValue() at System.Data.OleDb.OleDbParameter.GetParameterScale() at System.Data.OleDb.OleDbParameter.BindParameter(Int32 i, DBBindings bindings, tagDBPARAMBINDINFO[] bindInfo) at System.Data.OleDb.OleDbCommand.CreateAccessor() at System.Data.OleDb.OleDbCommand.InitializeCommand(CommandBehavior behavior, Boolean throwifnotsupported) at System.Data.OleDb.OleDbCommand.ExecuteCommand(CommandBehavior behavior, Object& executeResult) at System.Data.OleDb.OleDbCommand.ExecuteReaderInternal(CommandBehavior behavior, String method) at System.Data.OleDb.OleDbCommand.ExecuteNonQuery() at roomplaner.ObjektHinzu.Anlegen_Click(Object sender, EventArgs e) in C:\Inetpub\...\ObjektHinzu.aspx.vb:line 107

line 107 --> Command.ExecuteNonQuery()

 Dim Command As New OleDbCommand
 'create OleDb database connection
 Dim SQL_CONNECTION_STRING As String = "Provider=SQLOLEDB;Server=...;...."
 Command.Connection = New OleDbConnection(SQL_CONNECTION_STRING)
 'create SQL statement for INSERT into table
 Command.CommandText = "INSERT INTO t_object (Name, ObjectType, Category, Manufactor, Length, Width, Height, Text_Short, Text_Long, URL_Pic_Small, URL_Pic_Big, URL_Pic_Plan, URL_VET, VET_ObjectName, Material, Color, Price, ObjectLink, Comment, MaxSceneCount) values (?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?)"
 Command.CommandType = CommandType.Text
 'add input parameters and values to INSERT statement
 Command.Parameters.Add("@dotnet.itags.org.Name", OleDbType.VarChar, 100).Value = O_Name.Text
 Command.Parameters.Add("@dotnet.itags.org.ObjectType", OleDbType.BigInt, 8).Value = O_ObjectType.SelectedValue
 Command.Parameters.Add("@dotnet.itags.org.Category", OleDbType.BigInt, 8).Value = O_Category.SelectedValue
 Command.Parameters.Add("@dotnet.itags.org.Manufactor", OleDbType.BigInt, 8).Value = O_Manufactor.SelectedValue
 Command.Parameters.Add("@dotnet.itags.org.Length", OleDbType.Integer, 4).Value = O_Length.Text
 Command.Parameters.Add("@dotnet.itags.org.Width", OleDbType.Integer, 4).Value = O_Width.Text
 Command.Parameters.Add("@dotnet.itags.org.Height", OleDbType.Integer, 4).Value = O_Height.Text
 Command.Parameters.Add("@dotnet.itags.org.Text_Short", OleDbType.VarChar, 100).Value = O_Text_Short.Text
 Command.Parameters.Add("@dotnet.itags.org.Text_Long", OleDbType.VarChar, 500).Value = O_Text_Long.Text
 Command.Parameters.Add("@dotnet.itags.org.URL_Pic_Small", OleDbType.VarChar, 100).Value = "0"
 Command.Parameters.Add("@dotnet.itags.org.URL_Pic_Big", OleDbType.VarChar, 100).Value = "0"
 Command.Parameters.Add("@dotnet.itags.org.URL_Pic_Plan", OleDbType.VarChar, 100).Value = "0"
 Command.Parameters.Add("@dotnet.itags.org.URL_VET", OleDbType.VarChar, 100).Value = "0"
 Command.Parameters.Add("@dotnet.itags.org.VET_ObjectName", OleDbType.VarChar, 50).Value = O_VET_ObjectName.Text
 Command.Parameters.Add("@dotnet.itags.org.Material", OleDbType.BigInt, 8).Value = O_Material.SelectedValue
 Command.Parameters.Add("@dotnet.itags.org.Color", OleDbType.BigInt, 8).Value = O_Color.SelectedValue
 Command.Parameters.Add("@dotnet.itags.org.Price", OleDbType.VarChar, 50).Value = O_Price.Text
 Command.Parameters.Add("@dotnet.itags.org.ObjectLink", OleDbType.VarChar, 100).Value = O_ObjectLink.Text
 Command.Parameters.Add("@dotnet.itags.org.Comment", OleDbType.VarChar, 100).Value = O_Comment.Text
 Command.Parameters.Add("@dotnet.itags.org.MaxSceneCount", OleDbType.Integer, 4).Value = O_MaxSceneCount.Text
 Try
 Command.Connection.Open()
 Command.ExecuteNonQuery() 'save record
 Catch ex As Exception
 Response.Write("Exception:")
 Response.Write(ex.ToString)
 End Try
 Command.Connection.Close()
 End Sub

The error is associated with a call to System.Number.ParseInt32(). That tells me that one of the parameters is expected to contain an integer or a string representation of an integer but does not. Identify integer parameters. Then in the debugger, determine if any of them are:
1. Not assigned. If a string is provided, is it an empty string?
2. Contains other characters than digits?
These two cases will generate that exception. (The .net docs for Convert.ToInt32 say FormatException will occur when:value does not consist of an optional sign followed by a sequence of digits (zero through nine).)