Facing Problem When Upload File Using Asp.net

Question

iam facing problem when i uplad file to sql database it gave me the following message

can you please push your help

 

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 20: { Line 21: Line 22: string filename = Path.GetFileName(FileUpload1.PostedFile.FileName); Line 23: string extension = Path.GetExtension(filename); Line 24: string contentType = FileUpload1.PostedFile.ContentType;

 

the code that i use

protected void Button1_Click(object sender, EventArgs e)
{
string filename = Path.GetFileName(FileUpload1.PostedFile.FileName);
string extension = Path.GetExtension(filename);
string contentType = FileUpload1.PostedFile.ContentType;
HttpPostedFile file = FileUpload1.PostedFile;
byte[] document = new byte[file.ContentLength];
file.InputStream.Read(document, 0, file.ContentLength);
if ((extension == ".pdf") || (extension == ".doc") || (extension == ".docx") || (extension == ".xls"))//extension
{
if (file.ContentLength <= 31457280)//size
{
//Insert the Data in the Table
SCP.Insert_Script(filename, txtfilename.Text.Trim(), extension, contentType, document, document.Length);
}
else
{ Response.Write("Inavlid File size"); return; }
}
else
{
Response.Write("Inavlid File"); return;
}
}
for business layer I Used the following Code
public void Insert_Script(string _Name_File, string _DisplayName,string _Extension,string _ContentType, byte[] _FileData,int _FileSize)
{
DAL_CCRMUI.DataAccessLayer Dal = new DAL_CCRMUI.DataAccessLayer();
Dal.Open();
SqlParameter[] param = new SqlParameter[6];
param[0] = new SqlParameter("@Name_File", SqlDbType.VarChar,100)
{
Value =_Name_File
};
param[1] = new SqlParameter("@DisplayName", SqlDbType.VarChar,50)
{
Value = _DisplayName
};
param[2] = new SqlParameter("@Extension", SqlDbType.VarChar,10)
{
Value = _Extension
};
param[3] = new SqlParameter("@ContentType", SqlDbType.VarChar,200)
{
Value = _ContentType
};
param[4] = new SqlParameter("@FileData", SqlDbType.VarBinary, 5000)
{
Value = _FileData
};
param[5] = new SqlParameter("@FileSize", SqlDbType.BigInt)
{
Value = _FileSize

};
Dal.ExecuteProcedure("Insert_Document", param);
Dal.Close();
}