Object reference not set to an instance of an object.
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hi friends, i'm using vb.net for devloping a web application. my code shows nothing wrong. but when i click a button to add the entries this error is being shown. my other applications are also developed in the same manner but they do not show error. the only difference in this application is that i'm tring to enter data into database from text property of a label. can this be a cause. i'm unable to figure out please help me. Object reference not set to an instance of an object. Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.NullReferenceException: Object reference not set to an instance of an object. Source Error: Line 198: If DropDownList1.SelectedItem.Text = "Not Available" Then Line 199: insert = "INSERT INTO Transmittal(Project_Name, Username, [Date], [To], Kind_Attn, Title, Drw_Doc_Num, Copies, Rev_Num, Action)" + "VALUES ('" + TextBox7.Text + "', '" + Label10.Text + "', '" + Label17.Text + "', '" + TextBox1.Text + "', '" + TextBox2.Text + "', '" + TextBox10.Text + "', '" + TextBox11.Text + "', '" + TextBox8.Text + "', '" + TextBox5.Text + "', '" + TextBox6.Text + "' )" Line 200: OleDbDataAdapter1.InsertCommand.CommandText = (insert) Line 201: OleDbDataAdapter1.InsertCommand.ExecuteNonQuery() Line 202: OleDbConnection1.Close() Source File: C:\Inetpub\wwwroot\OM\trans.aspx.vb Line: 200 Stack Trace: [NullReferenceException: Object reference not set to an instance of an object.] OM.trans.Button4_Click(Object sender, EventArgs e) in C:\Inetpub\wwwroot\OM\trans.aspx.vb:200 System.Web.UI.WebControls.Button.OnClick(EventArgs e) +108 System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +57 System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +18 System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +33 System.Web.UI.Page.ProcessRequestMain() +1263
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hi friends, i'm using vb.net for devloping a web application. my code shows nothing wrong. but when i click a button to add the entries this error is being shown. my other applications are also developed in the same manner but they do not show error. the only difference in this application is that i'm tring to enter data into database from text property of a label. can this be a cause. i'm unable to figure out please help me. Object reference not set to an instance of an object. Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.NullReferenceException: Object reference not set to an instance of an object. Source Error: Line 198: If DropDownList1.SelectedItem.Text = "Not Available" Then Line 199: insert = "INSERT INTO Transmittal(Project_Name, Username, [Date], [To], Kind_Attn, Title, Drw_Doc_Num, Copies, Rev_Num, Action)" + "VALUES ('" + TextBox7.Text + "', '" + Label10.Text + "', '" + Label17.Text + "', '" + TextBox1.Text + "', '" + TextBox2.Text + "', '" + TextBox10.Text + "', '" + TextBox11.Text + "', '" + TextBox8.Text + "', '" + TextBox5.Text + "', '" + TextBox6.Text + "' )" Line 200: OleDbDataAdapter1.InsertCommand.CommandText = (insert) Line 201: OleDbDataAdapter1.InsertCommand.ExecuteNonQuery() Line 202: OleDbConnection1.Close() Source File: C:\Inetpub\wwwroot\OM\trans.aspx.vb Line: 200 Stack Trace: [NullReferenceException: Object reference not set to an instance of an object.] OM.trans.Button4_Click(Object sender, EventArgs e) in C:\Inetpub\wwwroot\OM\trans.aspx.vb:200 System.Web.UI.WebControls.Button.OnClick(EventArgs e) +108 System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +57 System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +18 System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +33 System.Web.UI.Page.ProcessRequestMain() +1263
I refer you to the answer I gave in the ASP.NET Forum[^]
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